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Lvbu KF Series Ebike Kit

Only one cable connection
Super Easy to fit without special tools

Smart Asssit system / High Efficient Output Arrangement / Assist Range upto 90KM / Bluetooth 5.0 / Induction cut off system / Built in Gyroscope / Road Slope degrees detection / All Terrain Application / Anti-theft tracking

  • (optional)
  • (optional)
  • Smart ebike kit

    Fast installation in 5 minutes

  • 16-29 inch

    Multiple wheel size

  • Bluetooth 5.0

    A new era of interactive experience

  • Speed ≤32km/h

    250/350W high speed permanent magnet motor

  • Micro Power

    Provides you the best cycling experience

  • Four control ways

    Cadence/Auto/Manual/Torque

Product Specifications

    Model
    KF30S
    Battery Capacity
    36V 9Ah
    Cell Quantity
    30 cells
    Charging time
    4.5 H
    Battery Type
    18650 power lithium ion battery
    Charger
    AC110V-AC220V, DC42V 2A, Type C plug
    Assist Range
    90km

    *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
    12"/14"/16"/20"/24"/26"/27.5"/28"/29"/700c
    Rated Power
    250W
    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)
    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
    1.74 kg
    Controller Weight
    0.4 kg
    Package
    10kg, 70*70*20cm

Just 2 steps to convert a normal bike into a smart ebike

The KF series ebike kit can be quickly installed on your bike. It can be installed by anyone in a few minutes. There are two simple steps to turn your normal bike into a smart ebike:

INSTALLATION REQUIREMENTS

Fits Every Size Of Bike

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

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 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

250-500W high speed brushless motor

Small size, light weight, high efficiency, smooth operation, long life
Planetary gear and clutch: no resistance, easy to ride even when the battery is dead.

Rated power:  250W/350W
Peak power:  500W
Voltage:  36
Structure:  Gear Drive
Efficiency:  >80%
Max torque:  35-40N.m
Top speed:  32km/h

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

Micro Power System

10 years of research and development has gone into creating a versatile and cost-effective product for cyclists.
The micro power 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 automatically increase power,downhill automatically cut off power.

5.0 Intelligent bluetooth connection

Bluetooth 5.0 module allows you to connect multiple devices at the same time

5 Smart Assist Modes

Thanks to the advanced algorithm, you can ride it naturally without any jerky and laggy, just like the electric assist is a part of you. It will work in tune with your pace. And we will keep on optimizing the system and publishing 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

Check the real time cycling data
and set the assist mode on the APP

And also you can check the speed, temperature, power, mileage, etc.

  • Real-time data
  • Riding speed
  • Battery
  • Temp
  • Mileage
  • Lock
  • Assist mode
  • Devices

Speed up to 32km/h

Speed limitation is settable in the APP.
*The default Speed limitation is 25km/h, you can set the speed limitation up to 32km/h in the APP.

Anti-theft tracking,lost bike tracking. 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 immediately and upload the information to the server.

IP65 waterproof

IP65 waterproof grade makes you ride freely in the rain.

Multifunction bottle battery

  • Powder coating finish

    More durable and stronger than painting,
    not easy to scratch

  • Extra fix point to hold the battery firmly

    New snap function between controller and battery,
    The battery holder can clip the handle of the battery
    and makes the battery stay in the holder firmly

  • Hidden lock

    The battery lock is located directly under the controller
    which is safe and concealed

  • Brand new Type-C charging

    The Type-C charge and discharge port

High quality rim, skilled wheel truing process

High-quality carbon steel spokes and high-quality knitting technology, the overall toughness is higher.
The tension of the spokes is 50-110 kgf, and the runout is 0.5-0.6mm.

Packing list

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FAQ

What is the range of the battery?

The battery is a high quality power lithium-ion battery, 36V, 8.7AH. The range is approximately 90 km+. But that does depend on many various factors, including terrain, slope, your weight and how much you pedal and your level of assist.

What are the battery dimensions?

The battery is 280mm 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.

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.

Will Lvbu kit fit my bike ?

LVBU kit will fit most bikes except thru axle. 

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.
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. 

How long does the battery take to charge?

Approximately 4.5 hours at the mains.  The battery comes with a charger.

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.

How much does the kit weigh?

The entire kit weights 6.8kg.

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.

Why is there a maximum speed of 15.5mph (25 kph)?

The legal speed limit for e-bikes in some countries is 15.5mph.  Therefore the kit has a default maximum setting of 25kph. It is possible to manually increase the speed up to 35kph (22mph), but this should only be done on private land.

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.

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.

420 REVIEWS - KF30S Ebike Conversion Kit
Ba?ar ?zcan
Norway , 1/15/2026
I always get a reply and the staff are very helpful. If you have a favourite bike like me and need through illness to change to an e-bike. Then the kit is the perfect choice. I love mine and it enables me to be in my happy place
Model: KF30S 250W 9Ah Front, 250W Motor, Front wheel ebike kit
Size: 700C (28"), 28 inch rim with tyre
Color: Black, #000000
Cathal Farrell
Estonia , 1/14/2026
I have the bottle-style kit (I don’t recall when they first came out), and it all has been working fine. It has plenty of power to help with the hills. Holds a nice charge after several years. I’m very happy with my purchases (I own two units), and I’m glad to see the battery is much less bulky.
Model: KF30S 350W 9Ah Front, Ebike kit for front wheel
Size: 700C (28"), 28 inch rim with tyre
Color: Blue, #0000ff
Reagan
Ireland , 1/13/2026
I love the kit with its ease of use, its ease of fitment and especially the battery shape because no one knows that is a battery lol.
Model: KF30S 250W 9Ah Rear, Ebike kit for rear wheel
Size: 700C (28"), 28 inch rim with tyre
Color: Black, #000000
Gareth
United Kingdom , 1/12/2026
All dealings with lvbu have been excellent. Ordering was simple, straightforward and smart. The kit is brilliant and makes cycling with a dodgy knee a really enjoyable experience. Thank you and keep up the good work!
Model: KF30S 250W 9Ah Front, 250W Motor, Front wheel ebike kit
Size: 24", 24 inch rim with tyre
Color: Black, #000000
Joe Story
Finland , 1/9/2026
Very happy with overall experience. Kit components are all of good quality. Easy to install and setup. Everything works as described out of the box. Helpdesk is always very helpful.
Model: KF30S 250W 9Ah Rear, Ebike kit for rear wheel
Size: 29", 29 inch rim with tyre
Color: Black, #000000
Maureen Edwards
United Kingdom , 1/8/2026
A great piece of kit to get up the hills in Sheffield
Model: TF30T 250W 9Ah Rear Motor with Torque Sensor for Thru Axle, Thru Axle
Size: 700C (28"), 28 inch rim with tyre
Color: Black, #000000
Max Christensen
United Kingdom , 1/7/2026
I’ve done two lvbu conversion kits and upgraded one to the new battery. Installation is easy (I opted for display) and batteries are quality but 2 nd gen don’t have as much battery life, maybe because of cold weather?
Model: TF30T 250W 9Ah Rear Motor with Torque Sensor for Thru Axle, Thru Axle
Size: 700C (28"), 28 inch rim with tyre
Color: Blue, #0000ff
Willa Carpenter
Hungary , 1/6/2026
As an older member of the population (wrinkly) I have found the freedom of the countryside extended by getting help on the hilly bits.can't say thankyou enough to the team at lvbu
Model: KF30S 250W 9Ah Front, 250W Motor, Front wheel ebike kit
Size: 27.5", 27.5 inch rim with tyre
Color: Blue, #0000ff
Toad
Australia , 1/5/2026
the kit was really easy to fit to my Trek dual sport and works fantastically, smooth and very quiet and ample power for the rides I do, I now have a really usable Ebike without the weight and cost of a conventional Ebike, well done LVBU.
Model: KF30S 350W 9Ah Front, Ebike kit for front wheel
Size: 26", 26 inch rim with tyre
Color: Blue, #0000ff
Dave Brocious
Norway , 1/4/2026
Great product, which has changed how I use my bike. Service support is quick to respond and help. Recommended.
Model: KF30T 250W 9Ah Rear Motor with Torque Sensor, KF30T 250W 9Ah Rear Motor with Torque Sensor
Size: 406-20", 20 inch rim with tyre
Color: Black, #000000
Lennard Steffen
Bulgaria , 12/31/2025
I am able to continue riding my long time favorite bike and the smaller battery provides a lighter option plus extended range by carrying an extra battery out two at much less cost than other alternatives.
Model: KF30S 250W 9Ah Rear, Ebike kit for rear wheel
Size: 700C (28"), 28 inch rim with tyre
Color: Blue, #0000ff
jonathan harrison
United Kingdom , 12/30/2025
I love and appreciate the kit so much! I share that with Everybody. So much so that 2 friends have purchased due to my recommendations and we cycle every week.!!
Model: KF30S 350W 9Ah Front, Ebike kit for front wheel
Size: 26", 26 inch rim with tyre
Color: Blue, #0000ff
Eric Schroeder
Australia , 12/29/2025
The email support was responsive and helpful. The installed product works GREAT! I installed this on my wife's bike and she loves it.
Model: KF30S 250W 9Ah Front, 250W Motor, Front wheel ebike kit
Size: 700C (28"), 28 inch rim with tyre
Color: Red, Red bottle battery
James Duksta
Germany , 12/26/2025
I already owned the all-in-one kit, but I couldn't resist the new bottle battery kit(KF30S) to have more range on my rides. The result is a lightweight, 13kg, super-performing bike. I had issues with the cable length, which was too long, but not big deals. I highly recommend this kit, which can be adapted to any situation.
Model: KF30S 250W 9Ah Rear, Ebike kit for rear wheel
Size: 700C (28"), 28 inch rim with tyre
Color: Black, #000000
Zósimo Valencia
Germany , 12/25/2025
My Wife and I Love our E-Bikes, this was excellent idea and best option for us. We already loved our existing bikes the to make them an E-Bike w/ the conversion kit was Awesome. The conversion kit was will thought and will made!! Thanks for your support and wonderful product!!
Model: KF30T 250W 9Ah Rear Motor with Torque Sensor, KF30T 250W 9Ah Rear Motor with Torque Sensor
Size: 26", 26 inch rim with tyre
Color: Blue, #0000ff
Benito García
Spain , 12/23/2025
A mega investment to upgrade my bike
Model: KF30S 250W 9Ah Rear, Ebike kit for rear wheel
Size: 700C (28"), 28 inch rim with tyre
Color: Black, #000000
neil bates
Germany , 12/22/2025
Purchased the KF30S bottle battery upgrade for my Vilano road bike. I have seen complaints that motor is underpowered, but ideal for someone just looking for a little help with hills and headwinds. This is not a hot rod e-bike. Average speed improved by 13-22 percent depending on power setting and wind conditions compared to previous unpowered rides. No longer need to downshift on moderate grades, but still getting plenty of exercise. Quicker startups but requires care in close riding (pedestrians, stop lights, broken pavement, etc.) because motor wants to accelerate. Wheel nut requires carrying additional wrench to change flats. Total net weight increase (wheel / battery / hardware) is 5-6KG compared to original bike wheel weight. I am thoroughly enjoying my new e-bike upgrade.
Model: KF30S 250W 9Ah Front, 250W Motor, Front wheel ebike kit
Size: 27.5", 27.5 inch rim with tyre
Color: Black, #000000
stuart
Spain , 12/17/2025
I like that you just add it to an existing bike so it's a lot lighter than an ebike that weighs about 70 pounds.
Model: KF30S 250W 9Ah Front, 250W Motor, Front wheel ebike kit
Size: 700C (28"), 28 inch rim with tyre
Color: Blue, #0000ff
philip watson
United Kingdom , 12/16/2025
I cycle to work and whilst going to work is a doddle, all down hill, getting home is very hard work with one very steep hill which I always had to get off and push the bike up. I'd been doing it 6 months and it wasn't getting any easier. I felt the fitness benefits of cycling so didn't want to cheat and get a full electric bike or moped. I just wanted some assistance going up hill. I bought the ebike kit from LVBU as it was cheaper and didn't have a lot of cash to throw at it. I was warned delivery could be around one month and this was accurate. A friend fitted it for me, I am super happy with my new electric assisted bike. I still can peddle so I am still keeping fit. In fact, I don't turn it on when going to work. I only turn it on coming home, when I get to the bottom of that hill, which I can now sail up, non stop. It puts a smile on my face! I only work 2 days a week and travel a couple of miles each way. Battery lasts well and in the couple of months I've been using it, I only had to charge it once.
Model: KF30S 250W 9Ah Front, 250W Motor, Front wheel ebike kit
Size: 26", 26 inch rim with tyre
Color: Black, #000000
Wayne
United States of America , 12/16/2025
It is wonderful to have added a boost to my hybrid bike. Much appreciated by my 70 year old legs. The conversion was not difficult. I'm very happy to have added the lvbu ebike kit. Money well spent!
Model: KF30T 250W 9Ah Rear Motor with Torque Sensor, KF30T 250W 9Ah Rear Motor with Torque Sensor
Size: 29", 29 inch rim with tyre
Color: Black, #000000
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