Edward Jackson

Edward Jackson

1564715760

How to use Web Workers in Angular app

Web apps would run better if heavy computations could be performed in the background, rather than compete with the user interface.

We need all apps to be very fast and highly responsive. Like lightning fast and responsive. So in that way, we have researched and found many ways of making our apps very fast, to keep our users. It is said humans are very impatient wait for an app to load or run some computations, we will leave a site if it takes ~3s to run/load. So check your analytics you may have a wonderful website but may have low visitors because of how performant (low or high) your app is, you need to check it today. In this post, we will discuss one of the optimization tricks to make our Angular apps highly performant.

Web Worker in general

Web Worker is really a worker, working its ass off because of the heavy load it is given. In computing context, Web Worker is a background thread that is created alongside/parallel the main thread where heavy computations are done to prevent drag on the main thread.

Web worker is one of the many workers we have in web. There are

All do the same thing, creating a background thread but run different functions. So the similar thing they do is create a parallel thread.

What is a thread? Whenever a program runs, it is allocated a space(memory address space) in RAM where its code and data are stored and executed by the CPU instruction by instruction one at a time. The memory space allocated is called the main thread. A thread is a piece of code that has its codespace inside a process. If a CPU supports multi-threading, it can run multiple threads at a time.

What is multi-threading? This is the concurrent execution/running of threads at the same time in a process. In Win, we create threads using the CreateThreadEx(…) API. This creates a codespace parallel to the main thread. The CPU executes both threads by executing one for a time saves its context, load the next thread in the registers and continues with its execution. This context switch happens on a scale of ~billionth(1/10^9) of a second that it appears to us to happen at the same time and very fast.

So in Worker, the JS engine creates a new thread and loads the JS script in the thread. In multi-threading, threads communicate with each other using shared resources. The shared resource is placed in a central place in the RAM where the threads can read/write to the resource thereby communicating with each other.

In the browser, we have the main thread which is called the DOM thread, during the loading of a new script in a tab, a DOM thread is created where the JS engine loads, parses and executes the JS files in the page. The Worker will create a new thread called the Worker Thread that will run a JS script parallel to the DOM thread. The JS script run by the Worker thread would not have a reference to the DOM because it is running in a different environment where no DOM APIs exists.

Using Web Worker

Like we said earlier, Workers don’t have access to the DOM APIs. They can’t access any of the following:

  • window object
  • document object

Web Workers can access:

  • navigator object
  • location object (read-only)
  • XMLHttpRequest
  • setTimeout(), clearTimeout(), setInterval(), clearInterval()
  • The atob() and btoa() functions

Web Workers can also access

  • Cache object

Web workers can run asynchronously and synchronously. Web Workers run their code from top to down then they enter into event loop, executing tasks/callbacks scheduled by event (APIs like setTimeout, setInterval, etc). First, they run synchronously executing the script then they enter asynchronous listening for events and executing them.

Web Worker provides methods/APIs that we can use to run our JS script. To instantiate a Worker, we run this:

const webWorker = new Worker('./script.js')

The JS script file is passed to the Worker when instantiating it. The Worker will create a new thread, parse and generate machine code from the JS script file, the machine code will be loaded in the new webWorker thread memory address space. Then the CPU will concurrently run the DOM thread and the webWorker thread.

Web Worker can send messages to the DOM thread that spawned it. It has several event listeners that trigger a registered callback when the event is fired.

onmessage

This is triggered when a message is received.

webWorker.onmessage = function(event) {
    // ...
 }

onerror

This is triggered when an error is thrown in the Worker.

webWorker.onerror = function(event) {
    // ...
 }

We can send messages using the postMessage API

From the DOM to the Web Worker

webWorker.postMessage(data)

From the Web Worker to the DOM thread:

postMessage(data)

We can listen for events using the addEventListener API

webWorker.addEventListener('message', function(evt) {
    // ...
 })

Using in Angular

It seems Web workers are used in vanilla JavaScript apps, most of us are addicted to Angular. We, Angular developers, have tried to use Web Workers in Angular but eh Webpack configuration and all proved very painful to setup. Up until the release of Angular CLI v8, using Web Workers in Angular, its setup, compiling, bundling and code-splitting was made easy by the CLI tool.

To generate a Web Worker, we run the ng g web-worker command:

ng g web-worker webworker

This will generate webworker.ts file in the src/app of an Angular app. The web-worker tells the CLI tools that the file would be used by a Worker.To demonstrate how to use Web worker in Angular to optimize its performance. Let’s say we have an app that calculates Fibonacci numbers. Finding Fibonacci numbers in the DOM thread will kinda impact the UI experience because the DOM and the user interactions would freeze until the number is found.Starting, our app would be like this:

// webWorker-demo/src/app/app.component.ts@Component({
    selector: 'app',
    template: `
        <div>
            <input type="number" [(ngModel)]="number" placeholder="Enter any number" />
            <button (click)="calcFib">Calc. Fib</button>
        </div>
        <div>{{output}}</div>
    `
})
export class App {
    private number
    private output
    calcFib() {
        this.output =fibonacci(this.number)
    }
}function fibonacci(num) {
    if (num == 1 || num == 2) {
        return 1
    }
    return fibonacci(num - 1) + fibonacci(num - 2)
}

Calculating Fibonacci numbers is recursive, passing small numbers like 0–900 would have no performance impact. Imagine passing ~10,000. That’s when we will begin to notice performance drag. Like we said the best bet is to move the fibonacci function or algorithm to execute in another thread. So no matter how large the number is, it will not be felt in the DOM thread.

So we scaffold a Web Worker file:

ng g web-worker webWorker

and move the fibonacci function into the file:

// webWorker-demo/src/app/webWorker.ts
function fibonacci(num) {
    if (num == 1 || num == 2) {
        return 1
    }
    return fibonacci(num - 1) + fibonacci(num - 2)
}self.addEventListener('message', (evt) => {
    const num = evt.data
    postMessage(fibonacci(num))
})

Now we will edit the app.component.ts to add Web Worker

// webWorker-demo/arc/app/app.component.ts@Component({
    selector: 'app',
    template: `
        <div>
            <input type="number" [(ngModel)]="number" placeholder="Enter any number" />
            <button (click)="calcFib">Calc. Fib</button>
        </div>
        <div>{{output}}</div>
    `
})
export class App implements OnInit{
    private number
    private output
    private webworker: Worker    ngOnInit() {
        if(typeof Worker !== 'undefined') {
            this.webWorker = new Worker('./webWorker')
            this.webWorker.onmessage = function(data) {
                this.output = data
            }
        }
    }    calcFib() {
        this.webWorker.postMessage(this.number)
    }
}

Our code is now 😘. We added ngOnInit lifecycle hook in our component so to initialize the Web Worker with the Web Worker file we generated earlier. We registered to listen to messages sent fro the Web Worker in the onmessage handler any data we get we will display it in the DOM.

We made the calcFib function to send the number to Web Worker. This below in webWorker would capture the number

self.addEventListener('message', (evt) => {
    const num = evt.data
    postMessage(fibonacci(num))
})

and processes the Fibonacci number then send the result back to the DOM thread. The onmessage we set up in the app.component

ngOnInit() {
        if(typeof Worker !== 'undefined') {
            this.webWorker = new Worker('./webWorker')
            this.webWorker.onmessage = function(data) {
                this.output = data
            }
        }
    }

would receive the result in datathen we will display the result in the DOM using the {{output}} interpolation.

During the processing of the Fibonacci numbers, the DOM thread would be left focusing on the user interactions while the webWorker would do the heavy processing.

Another Example: Prime Number

Let’s have a look at a simple example that calculates prime numbers:

// primes-demo/src/app/app.component.ts@Component({
    selector: 'app',
    template: `
        <div>
            <input type="number" [(ngModel)]="number" placeholder="Enter any number" />
            <button (click)="calcPrimes">Calc. Prime Numbers</button>
        </div>
        <div>{{output}}</div>
    `
})
export class App {
    private number
    private output    calcPrimes() {
        this.output = this.getPrimes(this.number)
    }    getPrimes(number) {
        if (typeof number == "number") {
            if(number<0){
                return "negative integers can not be prime";
            }
            if(number==0){
                return "zero is not a prime number";
            }
            if(number==1){
                return "1 is not a prime number";
            }
            var nonprimes = [],  // Array of non prime numbers
            var i,j,primes = []; // Array of prime numbers            for (i = 2; i <= number; ++i) {
                if (!nonprimes[i]) {
                    // i has not been marked -- it is prime
                    primes.push(i);
                    for (j = i << 1; j <= number; j += i) {
                        nonprimes[j] = true;
                    }
                }
            }
            return primes;  // Array of prime numbers
        }
        else{
            return "invalid input";
        }
    }
}

Number entered in the input box is held in the number property, when the Calc. Prime Numbers button is clicked the calcPrimesmethod is called which calls the getPrimes function, this contains the algorithm to calculate prime numbers of a number, this function returns an array that contains the number primes, then the calcPrimeassigns it to the output property which is displayed on the browser.

Prime number calculation can become expensive when the number increases, so prime number calculation is a good candidate to be offloaded to the Web Worker thread.

So we scaffold a new Web Worker file:

ng g web-worker primesWorker

Then we add the code to primesWorker:

// primes-demo/src/app/primesWorker.tsfunction getPrimes(number) {
    if (typeof number == "number") {
        if(number<0){
            return "negative integers can not be prime";
        }
        if(number==0){
            return "zero is not a prime number";
        }
        if(number==1){
            return "1 is not a prime number";
        }
        var nonprimes = [],  // Array of non prime numbers
        var i,j,primes = []; // Array of prime numbers        for (i = 2; i <= number; ++i) {
            if (!nonprimes[i]) {
                // i has not been marked -- it is prime
                primes.push(i);
                for (j = i << 1; j <= number; j += i) {
                    nonprimes[j] = true;
                }
            }
        }
        return primes;  // Array of prime numbers
    }
    else{
        return "invalid input";
    }
}self.addEventListener('message', (evt) => {
    const num = evt.data
    postMessage(getPrimes(num))
})

Then our app.component.ts will be rewritten to this:

// primes-demo/src/app/app.component.ts@Component({
    selector: 'app',
    template: `
        <div>
            <input type="number" [(ngModel)]="number" placeholder="Enter any number" />
            <button (click)="calcPrimes">Calc. Prime Numbers</button>
        </div>
        <div>{{output}}</div>
    `
})
export class App implements OnInit {
    private number
    private output
    private primesWorker: Worker    ngOnInit() {
        if(typeof Worker !== 'undefined') {
            this.primesWorker = new Worker('./primesWorker')
            this.primesWorker.onmessage = function(data) {
                this.output = data
            }
        }
    }    calcPrimes() {
        this.primesWorker.postMessage(this.number)
    }
}

The prime number calculation is now being done in another thread leaving the DOM thread free.The thing here is that the time it would take a heavy calculation to complete in the main thread is the same as in the Worker thread. Moving it off to the Worker thread doesn’t reduce the calculation speed, it just prevents the DOM thread from locking and becoming unresponsive.Terminating a workerAccording to Using Web Worker APIs — Wikipedia

If you need to immediately terminate a running worker from the main thread, you can do so by calling the worker’s terminate method:

webWorker.terminate();

The worker thread is killed immediately.In our Angular example, we didn’t kill the Worker thread. When the app.component.tsis destroyed the Worker thread will still be left open and be hanging around. This is very bad practice, we should clean up the Worker thread when we are done with it.To do so, we will utilize the ngOnDestroyhook in Angular. This hook is what Angular calls when a component is being destroyed, so we will terminate the Worker thread there.

// primes-demo/src/app/app.component.ts@Component({
    selector: 'app',
    template: `
        <div>
            <input type="number" [(ngModel)]="number" placeholder="Enter any number" />
            <button (click)="calcPrimes">Calc. Prime Numbers</button>
        </div>
        <div>{{output}}</div>
    `
})
export class App implements OnInit, OnDestroy {
    private number
    private output
    private primesWorker: Worker    ngOnInit() {
        if(typeof Worker !== 'undefined') {
            this.primesWorker = new Worker('./primesWorker')
            this.primesWorker.onmessage = function(data) {
                this.output = data
            }
        }
    }    calcPrimes() {
        this.primesWorker.postMessage(this.number)
    }    ngOnDestroy() {
        his.primesWorker.terminate()
    }
}

In the fibonacci example:

// webWorker-demo/arc/app/app.component.ts@Component({
    selector: 'app',
    template: `
        <div>
            <input type="number" [(ngModel)]="number" placeholder="Enter any number" />
            <button (click)="calcFib">Calc. Fib</button>
        </div>
        <div>{{output}}</div>
    `
})
export class App implements OnInit, OnDestroy {
    private number
    private output
    private webworker: Worker    ngOnInit() {
        if(typeof Worker !== 'undefined') {
            this.webWorker = new Worker('./webWorker')
            this.webWorker.onmessage = function(data) {
                this.output = data
            }
        }
    }    calcFib() {
        this.webWorker.postMessage(this.number)
    }    ngOnDestroy() {
        this.webWorker.terminate()
    }
}

Conclusion

In this post, we saw what Web Worker is, its APIS and how to use it. Further down, we saw how to use the Angular CLI to easily add Web Worker to our Angular apps and we saw its usage in Angular on how we moved our Fibonacci calculation to the Worker thread.

In as much Worker is good in offloading our work to the Worker thread, we should also try to write optimizable code in the Worker script because it would take the same time in the main thread. So adding Worker to a good JS code would be lit, your app would be blazingly fast 🚀.

If you have any question regarding this or anything I should add, correct or remove, feel free to comment, email or DM me.

#web-development #web-service #angular

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How to use Web Workers in Angular app

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Fredy  Larson

Fredy Larson

1595059664

How long does it take to develop/build an app?

With more of us using smartphones, the popularity of mobile applications has exploded. In the digital era, the number of people looking for products and services online is growing rapidly. Smartphone owners look for mobile applications that give them quick access to companies’ products and services. As a result, mobile apps provide customers with a lot of benefits in just one device.

Likewise, companies use mobile apps to increase customer loyalty and improve their services. Mobile Developers are in high demand as companies use apps not only to create brand awareness but also to gather information. For that reason, mobile apps are used as tools to collect valuable data from customers to help companies improve their offer.

There are many types of mobile applications, each with its own advantages. For example, native apps perform better, while web apps don’t need to be customized for the platform or operating system (OS). Likewise, hybrid apps provide users with comfortable user experience. However, you may be wondering how long it takes to develop an app.

To give you an idea of how long the app development process takes, here’s a short guide.

App Idea & Research

app-idea-research

_Average time spent: two to five weeks _

This is the initial stage and a crucial step in setting the project in the right direction. In this stage, you brainstorm ideas and select the best one. Apart from that, you’ll need to do some research to see if your idea is viable. Remember that coming up with an idea is easy; the hard part is to make it a reality.

All your ideas may seem viable, but you still have to run some tests to keep it as real as possible. For that reason, when Web Developers are building a web app, they analyze the available ideas to see which one is the best match for the targeted audience.

Targeting the right audience is crucial when you are developing an app. It saves time when shaping the app in the right direction as you have a clear set of objectives. Likewise, analyzing how the app affects the market is essential. During the research process, App Developers must gather information about potential competitors and threats. This helps the app owners develop strategies to tackle difficulties that come up after the launch.

The research process can take several weeks, but it determines how successful your app can be. For that reason, you must take your time to know all the weaknesses and strengths of the competitors, possible app strategies, and targeted audience.

The outcomes of this stage are app prototypes and the minimum feasible product.

#android app #frontend #ios app #minimum viable product (mvp) #mobile app development #web development #android app development #app development #app development for ios and android #app development process #ios and android app development #ios app development #stages in app development

Carmen  Grimes

Carmen Grimes

1595494844

How to start an electric scooter facility/fleet in a university campus/IT park

Are you leading an organization that has a large campus, e.g., a large university? You are probably thinking of introducing an electric scooter/bicycle fleet on the campus, and why wouldn’t you?

Introducing micro-mobility in your campus with the help of such a fleet would help the people on the campus significantly. People would save money since they don’t need to use a car for a short distance. Your campus will see a drastic reduction in congestion, moreover, its carbon footprint will reduce.

Micro-mobility is relatively new though and you would need help. You would need to select an appropriate fleet of vehicles. The people on your campus would need to find electric scooters or electric bikes for commuting, and you need to provide a solution for this.

To be more specific, you need a short-term electric bike rental app. With such an app, you will be able to easily offer micro-mobility to the people on the campus. We at Devathon have built Autorent exactly for this.

What does Autorent do and how can it help you? How does it enable you to introduce micro-mobility on your campus? We explain these in this article, however, we will touch upon a few basics first.

Micro-mobility: What it is

micro-mobility

You are probably thinking about micro-mobility relatively recently, aren’t you? A few relevant insights about it could help you to better appreciate its importance.

Micro-mobility is a new trend in transportation, and it uses vehicles that are considerably smaller than cars. Electric scooters (e-scooters) and electric bikes (e-bikes) are the most popular forms of micro-mobility, however, there are also e-unicycles and e-skateboards.

You might have already seen e-scooters, which are kick scooters that come with a motor. Thanks to its motor, an e-scooter can achieve a speed of up to 20 km/h. On the other hand, e-bikes are popular in China and Japan, and they come with a motor, and you can reach a speed of 40 km/h.

You obviously can’t use these vehicles for very long commutes, however, what if you need to travel a short distance? Even if you have a reasonable public transport facility in the city, it might not cover the route you need to take. Take the example of a large university campus. Such a campus is often at a considerable distance from the central business district of the city where it’s located. While public transport facilities may serve the central business district, they wouldn’t serve this large campus. Currently, many people drive their cars even for short distances.

As you know, that brings its own set of challenges. Vehicular traffic adds significantly to pollution, moreover, finding a parking spot can be hard in crowded urban districts.

Well, you can reduce your carbon footprint if you use an electric car. However, electric cars are still new, and many countries are still building the necessary infrastructure for them. Your large campus might not have the necessary infrastructure for them either. Presently, electric cars don’t represent a viable option in most geographies.

As a result, you need to buy and maintain a car even if your commute is short. In addition to dealing with parking problems, you need to spend significantly on your car.

All of these factors have combined to make people sit up and think seriously about cars. Many people are now seriously considering whether a car is really the best option even if they have to commute only a short distance.

This is where micro-mobility enters the picture. When you commute a short distance regularly, e-scooters or e-bikes are viable options. You limit your carbon footprints and you cut costs!

Businesses have seen this shift in thinking, and e-scooter companies like Lime and Bird have entered this field in a big way. They let you rent e-scooters by the minute. On the other hand, start-ups like Jump and Lyft have entered the e-bike market.

Think of your campus now! The people there might need to travel short distances within the campus, and e-scooters can really help them.

How micro-mobility can benefit you

benefits-micromobility

What advantages can you get from micro-mobility? Let’s take a deeper look into this question.

Micro-mobility can offer several advantages to the people on your campus, e.g.:

  • Affordability: Shared e-scooters are cheaper than other mass transportation options. Remember that the people on your campus will use them on a shared basis, and they will pay for their short commutes only. Well, depending on your operating model, you might even let them use shared e-scooters or e-bikes for free!
  • Convenience: Users don’t need to worry about finding parking spots for shared e-scooters since these are small. They can easily travel from point A to point B on your campus with the help of these e-scooters.
  • Environmentally sustainable: Shared e-scooters reduce the carbon footprint, moreover, they decongest the roads. Statistics from the pilot programs in cities like Portland and Denver showimpressive gains around this key aspect.
  • Safety: This one’s obvious, isn’t it? When people on your campus use small e-scooters or e-bikes instead of cars, the problem of overspeeding will disappear. you will see fewer accidents.

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Carmen  Grimes

Carmen Grimes

1595491178

Best Electric Bikes and Scooters for Rental Business or Campus Facility

The electric scooter revolution has caught on super-fast taking many cities across the globe by storm. eScooters, a renovated version of old-school scooters now turned into electric vehicles are an environmentally friendly solution to current on-demand commute problems. They work on engines, like cars, enabling short traveling distances without hassle. The result is that these groundbreaking electric machines can now provide faster transport for less — cheaper than Uber and faster than Metro.

Since they are durable, fast, easy to operate and maintain, and are more convenient to park compared to four-wheelers, the eScooters trend has and continues to spike interest as a promising growth area. Several companies and universities are increasingly setting up shop to provide eScooter services realizing a would-be profitable business model and a ready customer base that is university students or residents in need of faster and cheap travel going about their business in school, town, and other surrounding areas.

Electric Scooters Trends and Statistics

In many countries including the U.S., Canada, Mexico, U.K., Germany, France, China, Japan, India, Brazil and Mexico and more, a growing number of eScooter users both locals and tourists can now be seen effortlessly passing lines of drivers stuck in the endless and unmoving traffic.

A recent report by McKinsey revealed that the E-Scooter industry will be worth― $200 billion to $300 billion in the United States, $100 billion to $150 billion in Europe, and $30 billion to $50 billion in China in 2030. The e-Scooter revenue model will also spike and is projected to rise by more than 20% amounting to approximately $5 billion.

And, with a necessity to move people away from high carbon prints, traffic and congestion issues brought about by car-centric transport systems in cities, more and more city planners are developing more bike/scooter lanes and adopting zero-emission plans. This is the force behind the booming electric scooter market and the numbers will only go higher and higher.

Companies that have taken advantage of the growing eScooter trend develop an appthat allows them to provide efficient eScooter services. Such an app enables them to be able to locate bike pick-up and drop points through fully integrated google maps.

List of Best Electric Bikes for Rental Business or Campus Facility 2020:

It’s clear that e scooters will increasingly become more common and the e-scooter business model will continue to grab the attention of manufacturers, investors, entrepreneurs. All this should go ahead with a quest to know what are some of the best electric bikes in the market especially for anyone who would want to get started in the electric bikes/scooters rental business.

We have done a comprehensive list of the best electric bikes! Each bike has been reviewed in depth and includes a full list of specs and a photo.

Billy eBike

mobile-best-electric-bikes-scooters https://www.kickstarter.com/projects/enkicycles/billy-were-redefining-joyrides

To start us off is the Billy eBike, a powerful go-anywhere urban electric bike that’s specially designed to offer an exciting ride like no other whether you want to ride to the grocery store, cafe, work or school. The Billy eBike comes in 4 color options – Billy Blue, Polished aluminium, Artic white, and Stealth black.

Price: $2490

Available countries

Available in the USA, Europe, Asia, South Africa and Australia.This item ships from the USA. Buyers are therefore responsible for any taxes and/or customs duties incurred once it arrives in your country.

Features

  • Control – Ride with confidence with our ultra-wide BMX bars and a hyper-responsive twist throttle.
  • Stealth- Ride like a ninja with our Gates carbon drive that’s as smooth as butter and maintenance-free.
  • Drive – Ride further with our high torque fat bike motor, giving a better climbing performance.
  • Accelerate – Ride quicker with our 20-inch lightweight cutout rims for improved acceleration.
  • Customize – Ride your own way with 5 levels of power control. Each level determines power and speed.
  • Flickable – Ride harder with our BMX /MotoX inspired geometry and lightweight aluminum package

Specifications

  • Maximum speed: 20 mph (32 km/h)
  • Range per charge: 41 miles (66 km)
  • Maximum Power: 500W
  • Motor type: Fat Bike Motor: Bafang RM G060.500.DC
  • Load capacity: 300lbs (136kg)
  • Battery type: 13.6Ah Samsung lithium-ion,
  • Battery capacity: On/off-bike charging available
  • Weight: w/o batt. 48.5lbs (22kg), w/ batt. 54lbs (24.5kg)
  • Front Suspension: Fully adjustable air shock, preload/compression damping /lockout
  • Rear Suspension: spring, preload adjustment
  • Built-in GPS

Why Should You Buy This?

  • Riding fun and excitement
  • Better climbing ability and faster acceleration.
  • Ride with confidence
  • Billy folds for convenient storage and transportation.
  • Shorty levers connect to disc brakes ensuring you stop on a dime
  • belt drives are maintenance-free and clean (no oil or lubrication needed)

**Who Should Ride Billy? **

Both new and experienced riders

**Where to Buy? **Local distributors or ships from the USA.

Genze 200 series e-Bike

genze-best-electric-bikes-scooters https://www.genze.com/fleet/

Featuring a sleek and lightweight aluminum frame design, the 200-Series ebike takes your riding experience to greater heights. Available in both black and white this ebike comes with a connected app, which allows you to plan activities, map distances and routes while also allowing connections with fellow riders.

Price: $2099.00

Available countries

The Genze 200 series e-Bike is available at GenZe retail locations across the U.S or online via GenZe.com website. Customers from outside the US can ship the product while incurring the relevant charges.

Features

  • 2 Frame Options
  • 2 Sizes
  • Integrated/Removable Battery
  • Throttle and Pedal Assist Ride Modes
  • Integrated LCD Display
  • Connected App
  • 24 month warranty
  • GPS navigation
  • Bluetooth connectivity

Specifications

  • Maximum speed: 20 mph with throttle
  • Range per charge: 15-18 miles w/ throttle and 30-50 miles w/ pedal assist
  • Charging time: 3.5 hours
  • Motor type: Brushless Rear Hub Motor
  • Gears: Microshift Thumb Shifter
  • Battery type: Removable Samsung 36V, 9.6AH Li-Ion battery pack
  • Battery capacity: 36V and 350 Wh
  • Weight: 46 pounds
  • Derailleur: 8-speed Shimano
  • Brakes: Dual classic
  • Wheels: 26 x 20 inches
  • Frame: 16, and 18 inches
  • Operating Mode: Analog mode 5 levels of Pedal Assist Thrott­le Mode

Norco from eBikestore

norco-best-electric-bikes-scooters https://ebikestore.com/shop/norco-vlt-s2/

The Norco VLT S2 is a front suspension e-Bike with solid components alongside the reliable Bosch Performance Line Power systems that offer precise pedal assistance during any riding situation.

Price: $2,699.00

Available countries

This item is available via the various Norco bikes international distributors.

Features

  • VLT aluminum frame- for stiffness and wheel security.
  • Bosch e-bike system – for their reliability and performance.
  • E-bike components – for added durability.
  • Hydraulic disc brakes – offer riders more stopping power for safety and control at higher speeds.
  • Practical design features – to add convenience and versatility.

Specifications

  • Maximum speed: KMC X9 9spd
  • Motor type: Bosch Active Line
  • Gears: Shimano Altus RD-M2000, SGS, 9 Speed
  • Battery type: Power Pack 400
  • Battery capacity: 396Wh
  • Suspension: SR Suntour suspension fork
  • Frame: Norco VLT, Aluminum, 12x142mm TA Dropouts

Bodo EV

bodo-best-electric-bikes-scootershttp://www.bodoevs.com/bodoev/products_show.asp?product_id=13

Manufactured by Bodo Vehicle Group Limited, the Bodo EV is specially designed for strong power and extraordinary long service to facilitate super amazing rides. The Bodo Vehicle Company is a striking top in electric vehicles brand field in China and across the globe. Their Bodo EV will no doubt provide your riders with high-level riding satisfaction owing to its high-quality design, strength, breaking stability and speed.

Price: $799

Available countries

This item ships from China with buyers bearing the shipping costs and other variables prior to delivery.

Features

  • Reliable
  • Environment friendly
  • Comfortable riding
  • Fashionable
  • Economical
  • Durable – long service life
  • Braking stability
  • LED lighting technology

Specifications

  • Maximum speed: 45km/h
  • Range per charge: 50km per person
  • Charging time: 8 hours
  • Maximum Power: 3000W
  • Motor type: Brushless DC Motor
  • Load capacity: 100kg
  • Battery type: Lead-acid battery
  • Battery capacity: 60V 20AH
  • Weight: w/o battery 47kg

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