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INTELLIGENT
EBIKE KIT

  • INTELLIGENT
  • FASHION
  • SIMPLE

KN20S→

Product Specifications

    Model
    KN20S
    Battery Capacity
    36V6Ah
    Cell Quantity
    20 cells
    Charging time
    3H
    Battery Type
    18650 power lithium ion battery
    Charger
    AC110V - AC220V,DC42V 2A
    Assist Range
    60km

    *The assist range is under conditions: 60kg weight rider, ouside temperature 25℃,no wind, 50% assist level under manual mode, tires with enough air pressure, riding on flat level road.

    Top Speed
    32km/h
    Wheel size
    16" / 20" / 24" / 26" / 27.5" / 700c/ 29"
    Rated Power
    250W/350W
    Motor Structure
    Gear drive
    Motor Efficiency
    >80%
    Max Torque
    30N.m
    Wireless Connection
    Bluetooth 5.0 (Allows the controller to connect to multiple devices at the same time)
    Charge Socket
    Type C
    Product Dimensions
    Motor Weight
    2.6kg/2.55kg/3.25kg/3.45kg/2.7kg (250w Front/250w Rear/350w Front/350w Rear/250w Rear with torque sensor)
    Battery Weight
    1.35 kg
    Controller Weight
    0.34 kg
    Package
    71*71*22cm

PRODUCT ESSENTIALS

  • 5 MINS
    FAST INSTALLATION
  • 5 SMART
    ASSIST MODES
  • 250W/350W
    BRUSHLESS GEAR MOTOR
  • MAX SPEED
    UP TO 32 KM/H
  • ASSIST RANGE
    UP TO 60 KM
  • FIT FOR 12-29
    INCH WHEELSIZE

LVBU KN SERIES E-BIKE KIT

Smart E-bike wheel, just take 5 minutes to convert a normal bike into an E-bike
Beautiful bottle battery design/Assist range 60KM/Optional bluetooth display with thumb throttle/App control/Lost bike tracking/Smart assist system

INSTALLATION REQUIREMENTS

SIMPLE AND EASY INSTALLATION, JUST 5 MINS

  • REPLACE THE FRONT WHEEL
  • INSTALL THE BATTERY AND CONNECT
    THE CABLE WITH THE MOTOR

INSTALLATION REQUIREMENTS

OPTIONAL PARTS

  • BLUETOOTH DISPLAY
    (OPTIONAL)
  • BLUETOOTH CADENCE
    (OPTIONAL)

Fits Every Size Of Bike

KN series electric bicycle kit fits all standard bikes. It has multiple sizes from 16" to 29" and 700C

MULTIFUNCTION BOTTLE

Side power switch with a dust cover, a type-c charging port that doubles as a mobile phone charger, and a hidden battery level display screen under the cover.

LED DISPLAY

TYPE-C CHARGING
POWER SWITCH

KEYHOLE

BATTERY

The high-safety 18650 lithium battery features a portable and detachable design, comes in different colors, has an IP65 waterproof rating, can fully charge in 3 hours, and is equipped with a high-performance and high-safety BMS battery protection system.

  • Convenient
  • Battery safety
  • Fast charging

MOTOR

The LVBU 250W/350W BLDC motor is a small, light weight, efficient, and low-noise motor with planetary gear and clutch, providing stable performance, long life, and easy riding even when the battery is dead.

  • Power: 250W/350W
  • Efficiency (%): >80%
  • Structure: Gear Drive
  • Max Torque (N.m): 30-35

CONTROLLER

Micro Power system

The micropower system offers intelligent assistance with induction brakes that have a response time of 10ms. The system can sense the speed, acceleration and road slope, it will help you automatically when you pedal.

  • UPHILL
  • DOWNHILL
  • AUTOMATICALLY
    INCREASE POWER
  • AUTOMATICALLY
    CUT OFF POWER

ARM Cortex-M3 main chip

with 6-axis gyroscope motion processing chip
Configure Bluetooth 5.0 Moduel
6 high-sensitivity speed-measuring magnets for precise speed measurement

ENJOY A HAPPY RIDE

Gps lost bike tracking
The default maximum speed is 25km/h, you can set the speed limitation up to 32km/h in the APP.
Overspeed alarm makes it safer to ride.
IP65 waterproof grade makes you ride freely in the rain.

  • Lost bike tracking
  • Safety speed control
  • IP65 waterproof grade

APP

MAKE CYCLING MORE JOYFUL

You can use the APP to control the wheel, upgrade the firmware, set the assist mode, set the assist level, calibrate the gyroscope angle, and detect the fault. And also you can check the speed, temperature, power, mileage and track the location through the lost bike tracking function.

  • Commute mode
  • Leisure mode
  • Manual mode
  • Exercise mode
  • Climbing mode

PACKING LIST

1. Motor wheel 2. Battery and Controller 3. thumb throttle 4. Charger 5. Accessories 6. Manual

ENJOY SAFE RIDING

LVBU products have passed CE, ROHS, and MSDS certifications to ensure high safety and quality standards for the products.

Packing and Delivery

All LVBU products will be fully tested and packed well before delivery. And we have oversea warehouse for fast delivery in Europe.

Trade show

Products have achieved success in the global market by participating in popular exhibitions and developing distributors in various countries.

Welcome to send us your enquiry, we will contact you as soon as possible
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FAQ

What are the battery dimensions?

The battery is 235mm x 75mm.

Can I put the battery in my pannier instead of attaching it to the crossbar?

The battery holder must be positioned at an upward slope, therefore it’s best to be fixed on to your bike-frame. This is because there is a gyroscope inside it, which is part of the pedal assist technology.

Do I need a mobile phone to operate my bike?

No, using your mobile phone is your choice. If you want, you can download the Wepower app, where you can set the pedal assist mode, see the speed, temperature, battery level and mileage covered. But this is entirely optional, and the bike will function perfectly without it.

My bike has disc brakes – will the kit still work?

Yes, the kit fits both V brakes (sometimes called rim brakes) and disc brakes.

How does the pedal assist work?

The kit has an “intelligent assist control module” which works in conjunction with a gyroscope calculating the power you need.  It will assist you automatically when you are pedalling.  The motor will not work until the speed reaches 5km/h. The system will increase the power when you go uphill and will shut down the motor when you are going downhill.  When you brake, the system can detect the decrease of the speed, and will stop the motor.

If you push the thumb throttle the bike will be fully driven by electric power, but when you release it the pedal assist system will kick in again automatically.

How long does the battery take to charge?

Approximately 3.0 hours at the mains.  The battery comes with a charger.

How does Lvbu kit system work ?
  • Lvbu assist system is an intelligent assist system which can calculate out and provide the proper power based on the speed, acceleration, the slope of the road, and the assist level set in the APP or display. It will provide proper power automatically when you pedal. The motor will not work until the speed reaches 5 km/h. 
  • It will increase the power when it senses the acceleration is positive and decrease the power when it is minus. The system will also increase the power when going uphill and shut down the motor when going downhill. And the kit can also be controlled by the optional wireless thumb throttle. When you push the throttle, the bike will be fully driven by electric power, but when you release it the assist system will kick in again automatically. The introduction of the 5 assist modes is as following:
     * Manual mode: The most often used mode. The users can set a proper assist grade from 0 to 99 for themselves. 0 stands for no assist while 99 stands for the strongest assist. Under the manual mode the user can use the optional wireless display to set the assist grade instead of using smart phone. After setting the assist grade, the wheel will assist automatically.
     * Commute mode: Under this mode, the wheel will have relatively strong assist power all the time. The output curve of the assist grade is as shown above. It is similar to an assist grade of 60% in the manual mode.
     * Leisure mode: The assist power output is as the curve above. It is a curve similar to a damping ratio. Half an hour is a cycle. At the end of the cycle, the assist will become stronger.
     * Exercise mode: This mode has a small assist output. One cycle is also half an hour. After about 10 minutes, the assist power output will become stronger in the rest of the cycle.
     * Climbing mode: The wheel provides a certain assist grade only if the road is uphill that above a certain slope angle. The assist grade and the slope angle can be set in the APP. For example, when you set 2 degrees and an 80 assist grade, the wheel can give you an 80 assist grade when you are on the road with slope angle above 2 degrees.

     Note: Lvbu's intelligent assist system can be upgraded by the APP. We will keep optimizing the algorithm and publishing the new firmware.
Will Lvbu kit fit my bike ?

LVBU kit will fit most bikes except thru axle. 

Is Lvbu kit compatible with V brake?

Yes, Lvbu kit is compatible with rim brakes and disc brakes.

And a free new disc can be provided if you need.

Is it safe to use the front wheel drive?

Yes, it’s safe to use the front wheel drive. 

The power of the front wheel motors those lvbu ebike kit use are between 250w to 350w, so there is no safety problem. Actually, there are some advantages to using front motor drive: 

 It is more efficient to pull the bike compared to push the bike.

 The front motor will balance the weight of the front wheel with the rear wheel to make it stabler

 It is much easier to install the front wheel than the back wheel.

What are the functions of the APP?

The APP has two main kinds of functions as following: 

  • Set the parameters:
    ①Search and bind the Lvbu ebike kit: You need to search and bind the kit with the APP when you use it first time.
    ②Calibrate the gyroscope angle: The gyroscope angle must be calibrated after the first time you attach or reattach the kit to your bike.
    ③Set the assist mode or adjust the assist level.
    ④Set over-speed alarm.
    ⑤Set the maximum assist speed (speed limit).
    ⑥Lost report.
    ⑦Firmware upgrade.
    ⑧Restore factory settings.
    ⑨Set the wheel weight, load, wheel size, etc. ...
     After adjusting and setting the parameters, the system will automatically save values instantly.
  • Show cycling data:
    ①Riding speed
    ②Riding mileage: total mileage, current mileage, uphill mileage, etc.
    ③Kit model
    ④Bluetooth address
    ⑤APP version
    ⑥User instructions ...
    We are keeping optimizing the APP all the time, the new version of the firmware and the APP will be released from time to time, you can update it anywhere with the network of your mobile phone.

Do I have to connect to the APP while riding?

No, you don’t have to connect the kit with the APP when you are riding. The assist system is written in the controller, not in the APP. But before the first time you use it, you must calibrate the gyro angle for the bike.
You can set the assist grade in the APP and put your phone in your pocket. The kit will provide proper assist power for you automatically.

What is lvbu kit warranty policy?

For battery, motor and controller, we provide one year warranty.

Can I buy a spare battery?

Yes. We find the vast majority of people don’t need a spare, but if you want to go on very long bike rides you can double your range by charging a spare battery and taking it with you. You can purchase a spare battery here.

What’s included in the kit?

Wheel with 250W/350W motor, battery & battery holder, wired thumb throttle, instruction booklet, charger, tools for installation (allen key and wheel spanner).

Do I have to use the thumb controller?

No. The thumb controller is your choice. We find that some of our customers prefer not to use the thumb controller and that’s fine, the bike will automatically work on the pedal assist mode.

What if I don’t know my wheel/tyre size?

This is a common question.  Your tyre size should be written on the side of your tyre.  There will be a series of numbers showing the diameter and width.  It will look something like this: 700c x 38.  Occasionally different cycle manufacturers will use a different scale.  If you have any problems working out your tyre size, please call us on +86 199 7018 0785.  Alternatively, you can email us a picture of the writing on your tyre to miya@lvbu.tech

Does the kit accommodate hydraulic brakes?

Yes it does. The kit will automatically sense when the brakes are applied and cuts the power to the motor.

Is the import taxes included in the price? Do I need to pay taxes when I receive the ebike kit?

If the delivery address are in the countries below then you don't need to pay any taxes or VAT:

United Kingdom, United States, Canada, Australia, Russia, France, Germany, Italy, Spain, Sweden, Denmark, Ireland, Belgium, Netherlands, Czech, Republic, Austria, Portugal, Slovakia, Slovenia, Hungary, Bulgaria, Estonia, Greece, Poland, Lithuania, Finland, Latvia, Croatia, Ukraine.

How much does the kit weigh?

The entire kit weights 9kg.

What is the range of the battery?

The battery is a high quality power lithium-ion battery, 36V, 6AH. The range is approximately 60 km+. But that does depend on many various factors, including terrain, slope, your weight and how much you pedal and your level of assist.

How long is the lifetime of the battery?

Lvbu ebike kits use EV 18650 lithium-ion battery cells with class A quality. Working with our own BMS system, the lifetime of the battery is very high. 80% capacity remains after 1,000 cycles. So normally it can last 5 years.

*Note: The definition of one cycle is that charge the battery from 0 to 100% and discharge it fully. For example, if you charge the battery from the 0 to 50% and discharge it to 0, that is 0.5 cycle.

How to connect Lvbu kit with the APP?

Open the APP and allow all the permissions that the APP asks for. And tap the magnified glass icon on the right top of the APP to search for the Bluetooth address. Select the right address of your kit in the list to connect.
 
*Note: Please connect the kit in the APP, don’t connect it in the operation system of the phone. You don’t need to input any pin to connect. And please make sure all permissions are allowed and the kit is not connected to other devices. The kit can just connect to only one device at the same time.

How does Lvbu wheel recognize uphill?

Lvbu wheel has a built-in six-axis gyroscope, which can sense the slope of the road such as uphill and downhill. But if you want to detect the slope of the road correctly, you must calibrate the gyroscope angle on the level ground first. The way how gyroscope works is as below: 

  • The purpose of calibrating the gyroscope angle is to give the gyroscope a horizontal reference, telling the gyroscope that the current angle is level, so that the gyroscope can detect the slope. 
  • If the gyroscope is calibrated on a downhill road, the gyroscope will regard the downhill road with a certain angle as a horizontal road, but when the bike is on a level road, the gyroscope will sense it as an uphill, in that case the motor will always provide assistance; 
  • If the gyroscope is calibrated on an uphill road, the gyroscope will treat this uphill road as a horizontal road. And when the bike is on a level road, the system will shut down the motor because the gyroscope sense the level road as a downhill road by mistake.

    Therefore, you must calibrate the gyroscope on a level ground, otherwise there will be problem with the assist system.
How to connect LVBU ebike kit with Bluetooth display?

BTC02 Display Connect Method:

  • Please turn off or disconnect the Bluetooth connection on your phone before the Bluetooth display connects to the LVBU Wheel. The wheel cannot connect to more than one device at the same time; 
  • Press the power button of the Bluetooth display to turn it on. Then press the power button three times continuously. The display will search for the Bluetooth address of the lvbu ebike kits nearby; 
  • After the display finishes the search, press the up and down keys to select the right address of your kit and press the power button to connect.

DW03 Display Connect Method:

  • Open the APP and connect it with the Lvbu ebike kit
  • Press the power button of the Bluetooth display to turn it on.
  • Tap the "device" icon at the bottom right in the front page of the APP-->Tap "Add Device"--> Select the display in the list to connect.
Do you have a local dealer or oversea warehouse?

Yes, we have oversea warehouse in Europe.

And for some countries, we do have local dealers. 

301 REVIEWS - KN Series Ebike Conversion Kit
Leigh Parsons
Poland , 1/15/2026
Super easy to setup and works great. Easily get up to 20 mph and the different levels of pedal assist really help getting up hills or if I just want to go fast. Lots of fun and helps me ride my bike more especially if I am tired and would otherwise not have enough energy to ride my bike to work or school. I only use my car now for going to the store or trips out of town! Definitely would recommend to a friend.
Model: KN20S 250W 6Ah Front, KN20S Front wheel ebike kit
Size: 24", 24 inch rim with tyre
Color: Black, Black
Robert Wilson
United Kingdom , 1/14/2026
I love it. It was easy to install and has made cycling to work so much easier. Especially the hill at the end!
Model: KN20S 250W 6Ah Front, KN20S Front wheel ebike kit
Size: 406-20", 20 inch rim with tyre
Color: Black, Black
GREG
United States of America , 1/13/2026
The package arrived in perfect conditions. The installation process was really simple (what I found most difficult was removing the tire from the old wheel and putting it into the new one because I want to keep the two wheels look the same) I am loving the kit, I find myself creating situations so I can use the bike.
Model: KN20S 250W 6Ah Rear, KN20S Rear wheel ebike kit
Size: 26", 26 inch rim with tyre
Color: Black, Black
Aldert De Klerk
Germany , 1/12/2026
Can’t seem to stop pedaling now
Model: KN20S 250W 6Ah Front, KN20S Front wheel ebike kit
Size: 26", 26 inch rim with tyre
Color: Black, Black
Brayden Nicholson
Japan , 1/9/2026
My son is tackling those hills no problem now he has his assisted bike and he loves it! It's great!
Model: KN20S 250W 6Ah Front, KN20S Front wheel ebike kit
Size: 27.5", 27.5 inch rim with tyre
Color: Blue, Blue
James W. Parker
United States of America , 1/7/2026
The kit was easy to install onto my Trek Hybrid. Having peddle assist has made riding on gravel rail trails so much more enjoyable. I have two battery packs as my rides are longer than 60 miles. I really appreciate that I didn’t have to buy another bike and that I still have a bike that I can easily lift onto the bike rack. I frequently recommend LVBU to folks considering e-bikes.
Model: KN20S 350W 6Ah Front, KN20S Front wheel ebike kit
Size: 451-20”, 20"
Color: Blue, Blue
Ambre Savy
Australia , 1/6/2026
Great system, it's amazing how much more I use my bike now, my city got so much smaller, and I'm less sweaty and tired, but still get to exercise a bit ! I had trouble with the installation, as my breaks and derailleur needed to be adjusted by a professional afterwards. But it was not much trouble compared to the amount it saves me on the daily !! Thank you !
Model: KN20S 250W 6Ah Front, KN20S Front wheel ebike kit
Size: 451-20”, 20"
Color: Red, Red
Rick Ineman
United Kingdom , 1/5/2026
The ease of use and easy install were key to success.
Model: KN20S 250W 6Ah Front, KN20S Front wheel ebike kit
Size: 700C (28"), 28 inch rim with tyre
Color: Black, Black
Danny Neill
Spain , 1/4/2026
I love this kit. Took a while to ship but it was worth the wait. I’ve converted 3 other bikes with Bafang kits both mid drive and front hub kits at twice the price and this kit works every bit as well as those. I highly recommend this kit for a quick and easy conversion at a rwason
Model: KN20S 350W 6Ah Front, KN20S Front wheel ebike kit
Size: 700C (28"), 28 inch rim with tyre
Color: Black, Black
John Kinchin
Australia , 1/4/2026
I knew it would take some time to get my set, but everything happened according to the schedule, no delays. Very happy that I was able to convert my old Trek to an eBike. The battery is just enough to take me to work and for the return I need to charge it at the office. I guess a bit more battery power would be ideal, but did not care to upgrade to the next size due to the weight. I love it because I could still use my bike as a ‘traditional’ bike, without the battery, so I give it 5 stars
Model: KN20S 250W 6Ah Front, KN20S Front wheel ebike kit
Size: 26", 26 inch rim with tyre
Color: Black, Black
Elec Winner
United Kingdom , 12/31/2025
Ordering was straight forward. Delivery was fast considering it came from the UK. Install was a breeze for me since I'm pretty good with mechanical items. It fit perfectly on my 29" Schwinn mountain bike. Rides smooth and quiet. No one really knows you are on an electric bike unless they pay really close attention.
Model: KN20S 250W 6Ah Front, KN20S Front wheel ebike kit
Size: 29", 29 inch rim with tyre
Color: Black, Black
Ben Kopp
Austria , 12/30/2025
I first got lvbu bike kits for 2 road bikes after my wife had knee surgery and hills were a problem. We leave the batteries off for downhill parts of our rides and use the batteries to "flatten" the hills. We are both over 70, so swytch enables us to continue to ride.
Model: KN20S 250W 6Ah Front, KN20S Front wheel ebike kit
Size: 24", 24 inch rim with tyre
Color: Red, Red
Ian Poppleton
Norway , 12/29/2025
All the bits I ordered were delivered without any substitutions all be it a couple of weeks later than anticipated. I found it very easy to build my pedal cycle to an electric bike. It took me only one hour and 5 minutes from unboxing to riding my bike. I could have done it sooner but I read the detailed instructions throughly before putting it all together. I bought many of the extras which I’m happy with. Go for the larger capacity battery as I did if you can afford it. The motor is very responsive and a joy to ride. I love it! I actually prefer it to my big named electric bike bought six month’s earlier. 4 stars not 5 as the kit arrived 2 weeks later than scheduled.
Model: KN20T 250W 6Ah Rear Motor with Torque Sensor, KN20T 250W Rear Motor with Torque Sensor
Size: 26", 26 inch rim with tyre
Color: Black, Black
Clay Wells
Korea , 12/26/2025
Based on limited use it has worked well. Haven’t had a chance to test the range yet. Putting it all together was relatively easy following the online instructions.
Model: KN20S 350W 6Ah Front, KN20S Front wheel ebike kit
Size: 451-20”, 20"
Color: Silver, Silver
Elizabeth Chalmers
United Kingdom , 12/24/2025
Love my upgraded bike! It's perfect because I still get the exercise and the benefit of pedaling, but it makes riding more fun. I can go further and faster, so I can ride to places I wouldn't otherwise have been able to.
Model: KN20S 250W 6Ah Rear, KN20S Rear wheel ebike kit
Size: 24", 24 inch rim with tyre
Color: Red, Red
Hilbert Van der Beek
Belgium , 12/23/2025
Simple idea that just works
Model: KN20S 250W 6Ah Front, KN20S Front wheel ebike kit
Size: 451-20”, 20"
Color: Black, Black
Jill Santos
United Kingdom , 12/22/2025
A great way to electrify an existing bike. Installation was simple with clear instructions. Kit is well made and performs better than expected. A cost effective way of continuing to use a favourite bike but with the added benefit of electric power.
Model: KN20S 250W 6Ah Front, KN20S Front wheel ebike kit
Size: 26", 26 inch rim with tyre
Color: Black, Black
Martin Boulter
United States of America , 12/19/2025
I have purchased 3 kits over the past 2 years. Each one has worked perfect. Install is easy and bikes are fun to ride.
Model: KN20S 350W 6Ah Front, KN20S Front wheel ebike kit
Size: 700C (28"), 28 inch rim with tyre
Color: Blue, Blue
Douglas Kufus
Korea , 12/18/2025
They response my question on time and provide the best solution.
Model: KN20S 350W 6Ah Front, KN20S Front wheel ebike kit
Size: 451-20”, 20"
Color: Red, Red
Pakkausosasto haloo!
Australia , 12/17/2025
This kit has helped me rebuild my beloved bike. I can still use the bike I want to use but with the added benefit of it being electrical. I think I′m pushing the bike a lot since I go uphill very much. But it handles that very well. I would altough recommend getting the bigger battery to make sure it doesn't run out to soon.
Model: KN20S 250W 6Ah Front, KN20S Front wheel ebike kit
Size: 406-20", 20 inch rim with tyre
Color: Blue, Blue
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