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  • BOTTLE BATTERY
    EBIKE KIT FOR BROMPTON

    ASSIST RANGE UP TO 6OKM/SMART ASSSIT SYSTEM /BUILT IN GYROSCOPE /ROAD SLOPE DEGREES DETECTION /ALL TERRAIN APPLICATION /ANTI-THEFT TRACKING

  • SADDLE BAG BATTERY
    EBIKE KIT FOR BROMPTON

    ASSIST RANGE UP TO 9O-120KM/SMARTASSSIT SYSTEM /BUILT IN GYROSCOPE /ROAD SLOPE DEGREES DETECTION /ALL TERRAIN APPLICATION /ANTI-THEFT TRACKING

  • 3 Steps

    Fast installation

  • 25km/h

    Safe speed

  • Bluetooth 5.0

    A new era of interactive experience

  • 3 drive ways

    Pedal assist / Cadence /Throttle

  • 5 modes

    Intelligent assist modes

  • 250W

    High Effectiency Brushless motor

Product Specifications

    Model
    KN20S / KD30S / KD40S
    Battery Capacity
    36V 6Ah / 36V 9Ah / 36V 12AH
    Charging time
    3H
    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
    25km/h
    Wheel size
    16"
    Rated Power
    250W
    Max Torque
    30N.m
    Product Dimensions
    KN Series
    Product Dimensions
    KD Series
    Motor Weight
    1.7kg
    Battery Weight
    1.35kg/1.74kg/2.22kg (KN20S/KD30S/KD40S)
    Controller Weight
    0.34kg/0.34kg/0.34kg (KN20S/KD30S/KD40S)
    Package
    50*21*59cm

INSTALLATION VIDEO

Just 3 steps to convert a normal bike into a smart ebike

Installation requirements

  • Step 1:Pls.confirm the front fork open width is 74mm.
  • Step 2:Pls.confirm socket groove open width is 8mm.

Installation Completed

High quality 18650 lithium battery

EV lithium-ion battery cell with internal resistance as low as 18mΩ, capacity of 2900mA, 3C high-rate discharge.The 18650 power lithium battery offers consistency, high energy density, and faster charge-discharge performance. Tried and tested over time, 80% capacity remains after 1000 cycles.

Using Taiwan high-performance and high-safety BMS battery protection system

  • Over-discharge protection
  • Over current protection
  • Temperature protection
  • Over charge protection
  • Short circuit protection
  • Battery balance

Battery Detail Overview

  • LED DISPLAY SCREEN

    Battery level clearly visible

    POWER SWITCH

    Conserve battery life

    BATTERY LOCK

    Fixed battery, safer for cycling

  • POWER SWITCH

    Conserve battery life

    COATED SADDLE BATTERY BAG

    Waterproof and easy to move

    PREMIUM CABLE

    High-quality durable

Micro power system

10 years of research and development has gone into creating a versatile and cost-effective product for cyclists. 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.

250W high speed brushless permanent magnet

Small size, light weight, high efficiency, stable operation, long life time Planetary gear and clutch:lt's easy to ride even when the battery is dead.

250W
Rated power
500W
Peak power

Power :  250W
Voltage : 36V
Structure :  Gear Drive
Efficiency :  >80%
Maximum torque :  35N.m

ARM Cortex-M3 main chip

With 6-axis gyroscope motion processing chip
Configure Bluetooth Low Energy 5.0
10 pieces of high-sensitivity speed measuring magnets for precise speed measurement

Dedicated APP provides you wonderful cycling experience

you can use the APP to control the wheels, 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, etc.

Overspeed alarm makes it safer to ride

You can set the overspeed alarm value in the APP. It will alarm when the speed is over the value you set.

5 smart assist modes

We have spent 5 years on developing and optimizing the assist system. The assist system is based on the speed, acceleration, the road slope, and also the assist level that you set in the APP or on the Bluetooth display, calculating out the power you need. it will assist you automatically when you pedal. And we will keep on optimizing the system and publish it from time to time. You will be able to update the system via the APP.

Leisure mode Commute mode Exercise mode Manual mode Climbing mode

Lost bike tracking function You can report lost when your bike is stolen

After you report lost, once the thief tried to connect the wheel with the APP, the system will locate the mobile phone, disable the motor immediatelyand upload the information to the server.

How does it look on your Brompton ?

Welcome to send us your enquiry, we will contact you as soon as possible
The message will be saved after closing the window
 
 
39 REVIEWS - Lvbu EBike Kit-Brompton
Edgar Wells
United Kingdom , 1/8/2026
15mph on a Brompton without breaking into a sweat! I've put more life into my Brompton, extended my range and can go up the steepest hills (Chilterns area) without having to dismount. I'm pleased with it. I'd be even more pleased if it would do 15mph up the steepest hills, but that might require a motor that wouldn't be road legal. On a couple of undulating routes in the Chilterns, think hills again, the battery comfortably managed just over 15 miles, and still 50% charge left in the battery.
Model: KN20S 250W 6Ah front for Brompton, 250W Motor, Front wheel ebike kit
Size: 16'', 16 inch rim with tyre
Color: black, black
Nestor Godínez
Japan , 12/31/2025
I fitted the 250w kit about 15 months ago to my 2022 Brompton the instructions were good and was easy to fit the kit and has made it a pleasure to ride the bike now at 70 years old I recommend this kit for a Brompton, the only one lvbu needs to improve now is the order to delivery time.
Model: KD40S 250W 12Ah front for brompton, 250W
Size: 16'', 16 inch rim with tyre
Color: black, black
Waleed
Chile , 12/26/2025
A wonderful bike trip to Santiago Ways with my Brompton and the lvbu ebike kit. Wouldn't make it without the assist of the kit when taking all the climbs up to 5000+ feet and solid glide down the hills on this 16" folding bike.
Model: KD30S 250W 9Ah front for Brompton, 250W
Size: 16'', 16 inch rim with tyre
Color: black, black
Erasmo Xiberta
Malaysia , 12/25/2025
Transformative! The kit was easy to fit. It makes such a difference. I just love it>
Model: KN20S 250W 6Ah front for Brompton, 250W Motor, Front wheel ebike kit
Size: 16'', 16 inch rim with tyre
Color: black, black
Meindert Dijkhuis
Japan , 12/23/2025
Brilliant bit of kit. Works like a dream, quick and responsive. Reasonable priced, great customer service. The only reason I scored it down from a 5 star is the waiting time.
Model: KN20S 250W 6Ah front for Brompton, 250W Motor, Front wheel ebike kit
Size: 16'', 16 inch rim with tyre
Color: black, black
Cesario Mazza
Japan , 12/18/2025
Great customer experience. Very responsive and helpful. Dealt with my enquiry very well.
Model: KN20S 250W 6Ah front for Brompton, 250W Motor, Front wheel ebike kit
Size: 16'', 16 inch rim with tyre
Color: Kn Blue, Blue
F Kiemle
Sweden , 12/16/2025
Great customer service backing up a great product
Model: KN20S 250W 6Ah front for Brompton, 250W Motor, Front wheel ebike kit
Size: 16'', 16 inch rim with tyre
Color: black, black
Shaun Nimmo
Japan , 12/10/2025
Sat on the fence for around a year debating on getting an ebike and after test-riding my friend's bike, I decided to buy it. Miya is a very nice person, and her bike is great. She was always ready to answer any questions before and after the sale. Excellent!!
Model: KN20S 250W 6Ah front for Brompton, 250W Motor, Front wheel ebike kit
Size: 16'', 16 inch rim with tyre
Color: black, black
Todd Scoles
Germany , 11/26/2025
Great bit of kit, lot cheaper than the Brompton official bike, makes a real difference not arriving in the office all sweaty! Pretty easy to fit, you tube has plenty of advice videos.
Model: KN20S 250W 6Ah front for Brompton, 250W Motor, Front wheel ebike kit
Size: 16'', 16 inch rim with tyre
Color: black, black
Ryan
Singapore , 11/20/2025
I have an old Brompton (at least 20 years), which is heavy and, of course, adding the conversion motor makes it even heavier. Neverthless, at my age (70+), even with a little extra weight, I need all the help I can get and it works so well that it's given my old bike (and me!) a new lease of life - for me, strictly in summer. Highly recommended. It has a great future!!!
Model: KN20S 250W 6Ah front for Brompton, 250W Motor, Front wheel ebike kit
Size: 16'', 16 inch rim with tyre
Color: black, black
Cahill
Germany , 11/18/2025
I have just ordered from LVBU, a kit to update my Brompton from an ordinary folding bike to a smart e-bike. Easy process with excellent assistance from their online customer service.
Model: KD40S 250W 12Ah front for brompton, 250W
Size: 16'', 16 inch rim with tyre
Color: black, black
sky oakes-nash
Singapore , 11/4/2025
I have had my kit for around three years now . I find it works so well ; is. cheaper to run than my full electric bike , and my Brompton + lvbu conversion system is lighter than the fully electric bike .I totally recommend LVBU ??
Model: KN20S 250W 6Ah front for Brompton, 250W Motor, Front wheel ebike kit
Size: 16'', 16 inch rim with tyre
Color: black, black
Nicky West
Poland , 11/3/2025
I wasn't sure how this process was going to work, but miya held my hand through this. She was so patient and communicated so well. The process took a lot quicker than I expected.
Model: KN20S 250W 6Ah front for Brompton, 250W Motor, Front wheel ebike kit
Size: 16'', 16 inch rim with tyre
Color: Kn Red, Red
Tim Bevan
Malaysia , 10/30/2025
Easy setup and great to ride. Took me about 30 minutes start to finish. Hardest part? No, at all.
Model: KD30S 250W 9Ah front for Brompton, 250W
Size: 16'', 16 inch rim with tyre
Color: black, black
Paul Bess
Hongkong(China) , 10/28/2025
I appreciate the simplicity of the assembly and the performance of the hardware. My Brompton has regained a second youth.
Model: KN20S 250W 6Ah front for Brompton, 250W Motor, Front wheel ebike kit
Size: 16'', 16 inch rim with tyre
Color: black, black
Michèlle
Netherlands , 10/24/2025
Fijn contact, kon snel terecht en vriendelijk geholpen! Echt een aanrader!
Model: KD40S 250W 12Ah front for brompton, 250W
Size: 16'', 16 inch rim with tyre
Color: black, black
George Arjen
Japan , 10/22/2025
The order process was very straightforward and I was kept informed of progress. The kit was well packaged and all the parts easy to identify. The assembly was a little tricky on the Brompton but everything was everything fits and works very well. The sudden take up of power took me by surprise but it makes living on top of a long hill easy, again.
Model: KD30S 250W 9Ah front for Brompton, 250W
Size: 16'', 16 inch rim with tyre
Color: black, black
Mr. Richard
Malaysia , 10/21/2025
Great kit, highly recommended
Model: KN20S 250W 6Ah front for Brompton, 250W Motor, Front wheel ebike kit
Size: 16'', 16 inch rim with tyre
Color: black, black
Nathan Cole
Sweden , 10/20/2025
Quick easy bought the bike kit and was delivered within 30 days and fantastic communication with the lvbu team
Model: KN20S 250W 6Ah front for Brompton, 250W Motor, Front wheel ebike kit
Size: 16'', 16 inch rim with tyre
Color: black, black
Hiroshi K.
Japan , 10/17/2025
I installed the KD kit on my Brompton, and it fits perfectly! The whole system looks clean and elegant. I use it for my daily commute in the city, and it’s been super reliable. Definitely worth it.
Model: KD40S 250W 12Ah front for brompton, 250W
Size: 16'', 16 inch rim with tyre
Color: black, black
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