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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
 
 
102 REVIEWS - Lvbu EBike Kit-Brompton
Louise Dews
Netherlands , 8/24/2026
Well, I haven't yet received the kit for my good old Brompton but I have reached out to customer services with several questions in 2 emails and both emails were answered swifty and completely. With a radical new product such as this it is good to be able to get as much information as possible before investing and Miya have got this covered. Very impressed so far.
Model: KN20S Bottle battery 250W 6Ah front for Brompton, 250W Motor, Front wheel ebike kit
Size: 16'', 16 inch rim with tyre
Color: black, black
Laurent Coudene
France , 8/24/2026
The system works fully with my Brompton since 2 years. Have had a little problem with the charger... Service maintenance was very nice and helpful, problem quickly solved ! Thanks a lot !
Model: KD30S Saddle bag battery 250W 9Ah front for Brompton, 250W
Size: 16'', 16 inch rim with tyre
Color: black, black
Remy
Germany , 8/21/2026
Good quality bike. The motor-wheel looks nice with the silver color and it also seems well-built. The wiring and components are easy to install and don't require knowledge of mechanics and how to disassemble bike parts like other e-bike manufacturers. It has nice power in ranges 10-25 km/h, above that you have to pedal harder to get higher speed. I'm happy with the purchase, thanks.
Model: KD40S Saddle bag battery 250W 12Ah front for brompton, 250W
Size: 16'', 16 inch rim with tyre
Color: black, black
John Elliott
United Kingdom , 8/20/2026
I did the original conversion on my Brompton some time ago. I have now upgraded to the smaller power pack, which is even better.
Model: KN20S Bottle battery 250W 6Ah front for Brompton, 250W Motor, Front wheel ebike kit
Size: 16'', 16 inch rim with tyre
Color: black, black
Igi
Slovakia , 8/19/2026
I have it on my Brompton. I really like it and I appreciate communication with support. Thanks.
Model: KN20S Bottle battery 250W 6Ah front for Brompton, 250W Motor, Front wheel ebike kit
Size: 16'', 16 inch rim with tyre
Color: black, black
Arman
United Kingdom , 8/18/2026
I prefer the smart bike kit for my Brompton to the own Brompton ebike. I had my kit installed by GEZ in London and have now found a great maintenance team that knows how they work.
Model: KD40S Saddle bag battery 250W 12Ah front for brompton, 250W
Size: 16'', 16 inch rim with tyre
Color: black, black
Benj
United Kingdom , 8/14/2026
Good quality, easy to assemble, fun to use. We bought two of these and both bikes work really great and we’re enjoying riding them.
Model: KN20S Bottle battery 250W 6Ah front for Brompton, 250W Motor, Front wheel ebike kit
Size: 16'', 16 inch rim with tyre
Color: black, black
Graham Clement
United Kingdom , 8/6/2026
Liked the idea and the set up of the kit, saw a few videos on Youtube, very informative and increased my interest so ordered a kit with the option of black wheel and motor colour. Install very happy with the performance and service, will get another kit for an additional cycle . . .
Model: KD30S Saddle bag battery 250W 9Ah front for Brompton, 250W
Size: 16'', 16 inch rim with tyre
Color: black, black
richard morris
Germany , 8/5/2026
I’m no great mechanic but putting the motor kit onto a Brompton was v easy. We live up a rough steep track and the bike flies up. Miya were v helpful and speedy when I thought a part hadn’t arrived.
Model: KD40S Saddle bag battery 250W 12Ah front for brompton, 250W
Size: 16'', 16 inch rim with tyre
Color: black, black
Johny Van de Vyver
Belgium , 8/3/2026
It's been a great experience to have my old bike electrified! Installation was fairly easy, but in some cases you have to be a bit of a handyman.Great kit and service!
Model: KN20S Bottle battery 250W 6Ah front for Brompton, 250W Motor, Front wheel ebike kit
Size: 16'', 16 inch rim with tyre
Color: black, black
Mike Crowhurst
Germany , 7/31/2026
My little Brompton bike has been electrified…I love my Brompton bike, but on a commute I hate struggling up steep hills, arriving sweaty to a meeting. The remedy to this - fitting an electric motor to my bike. It took about half an hour to do. Now, hills are effortless. I don’t arrive weary at meetings. I still get a work out and enjoy my Brompton even more. A wonderful little invention.
Model: KD40S Saddle bag battery 250W 12Ah front for brompton, 250W
Size: 16'', 16 inch rim with tyre
Color: black, black
M. Collis
United Kingdom , 7/29/2026
I have had this kit on my Brompton since 2021. 3 years on, and I'm happy to report it's still functioning well. The kit was easy to install and after sales support has been great (I had an issue with my App recently and emailed the Support team who responded with detailed instructions on what I could check. Again super easy to follow their instructions and all resolved!). Really pleased with my purchase and would definitely recommend.
Model: KD40S Saddle bag battery 250W 12Ah front for brompton, 250W
Size: 16'', 16 inch rim with tyre
Color: black, black
David L, Allemagne
Germany , 7/29/2026
I love my 2 kits (for Brompton and Mountain bike). I bought the first kit in Oct 2023 for my Brompton and then I bought the 2nd kit for my MTB with the Black Friday sales later in the year. I have 3 batteries so I can go much further. This has changed my life as I leave my car in the garage and I commute exclusively by bike ever since. I needed this kit to go up the slope near my workplace. The support people has always been quick, helpful and reliable when I needed their support with the PAS magnet montage. I can only recommend further. David Lemoigne Munich, Germany ????
Model: KN20S Bottle battery 250W 6Ah front for Brompton, 250W Motor, Front wheel ebike kit
Size: 16'', 16 inch rim with tyre
Color: black, black
Krriso
Korea , 7/27/2026
Great customer support. Very quick and helpful. All my questions have been answered. 100% recommendation.
Model: KN20S Bottle battery 250W 6Ah front for Brompton, 250W Motor, Front wheel ebike kit
Size: 16'', 16 inch rim with tyre
Color: black, black
Michael Gie?
Germany , 7/22/2026
I received clear and concise answers to my emailed questions within a couple of hours of sending them. Perfect!
Model: KN20S Bottle battery 250W 6Ah front for Brompton, 250W Motor, Front wheel ebike kit
Size: 16'', 16 inch rim with tyre
Color: Kn Black, Black
Trevor
United Kingdom , 7/21/2026
Great product,easily fitted. Due to heart problem could not use my Brompton, now back in sadle and out and about, small dog in carrier too
Model: KN20S Bottle battery 250W 6Ah front for Brompton, 250W Motor, Front wheel ebike kit
Size: 16'', 16 inch rim with tyre
Color: Kn Blue, Blue
???
Korea , 7/20/2026
I installed the kit on my Brompton folding bike, which has allowed me to travel further distances than before. This enhancement has brought me immense joy and expanded my horizons in cycling. The kit is lightweight, easy to install, and affordable. I hope many people will take advantage of it.
Model: KN20S Bottle battery 250W 6Ah front for Brompton, 250W Motor, Front wheel ebike kit
Size: 16'', 16 inch rim with tyre
Color: black, black
Wojciech Grusznis
Germany , 7/17/2026
Best kit ever.. my Brompton C-line is a light ebike that takes me further and further!! I have the largest batt. It’s just perfect!! Well done guys!! I just wish the controller can be connected vertically as well as horizontal
Model: KD40S Saddle bag battery 250W 12Ah front for brompton, 250W
Size: 16'', 16 inch rim with tyre
Color: black, black
Lynne Barnes
France , 7/13/2026
We are still enjoying our kits two years after first getting them. We use them on our Brompton when we are travelling with our campervan as well as at home. Using the motor kit on my Brompton helped ease me back into cycling after a knee replacement operation.
Model: KN20S Bottle battery 250W 6Ah front for Brompton, 250W Motor, Front wheel ebike kit
Size: 16'', 16 inch rim with tyre
Color: black, black
Raphael Sanchez
Malaysia , 7/6/2026
I recently called customer service in order to get an accessory for my kit and despite the distance, living in Malaysia, I received my order quickly, good job, well done
Model: KD30S Saddle bag battery 250W 9Ah front for Brompton, 250W
Size: 16'', 16 inch rim with tyre
Color: black, black
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