Folding Freedom: Brompton also offers electric assist.

As urban mobility increasingly values “lightweight, fast, and portable” solutions, folding bikes have become the top choice for many commuters thanks to their compact and agile design. However, when it comes to uphill climbs or longer routes, the physical effort required can sometimes be discouraging. That’s where adding an electric assist bike kit comes in—enhancing performance without sacrificing portability, and offering a smarter, more effortless way for city riders to move through their day.

Lvbu KN series brompton electric conversion kit and KD series brompton e bike kit, designed specifically for Brompton folding bikes, offer a smart electric assist ebike conversion solution tailored for compact commuting. The series includes three main models — KN20S brompton electric kit, KD30S brompton electric conversion kit, and KD40S swytch brompton kit— each featuring different ebikeling battery configurations: a 36V 6Ah bottle battery, a 36V 9Ah saddle bag battery, and a 36V 12Ah high-capacity saddle bag battery. With a charging time of about 3~6 hours, these options cover a wide range of needs, from daily short-distance commuting to long weekend rides.

Core Specifications and Highlights
Rated Power: 250W.
Speed: top assist speed limited to 25 km/h (EU compliant).
Wheel Size: 16 inches/20 inches — precisely engineered for brompton ebike conversion.
Range: Up to 60 km with the KN20S bottle battery ebike conversion kit under standard test conditions; the saddle bag batteries KD30S and KD40S extend range to 90–120 km, ideal for long-distance commuting.
Torque Output: Rated torque around 30 N·m, providing stronger starts and climbing power.
Weight: Motor approx. 1.7 kg; battery (depending on model) about 1.35 / 1.74 / 2.22 kg; controller approx. 0.34 kg — achieving a perfect balance between lightness and steady performance.
Smart Features: Built-in 6-axis gyroscope and slope detection, Bluetooth 5.0, 10 high-sensitivity speed magnets, dedicated Lvbu WePower App (supporting assist mode adjustment, gyroscope calibration, firmware updates, and fault diagnostics), plus an anti-theft location function.

With these advantages, the KN/KD series brompton conversion kit preserves the portability and folding convenience of Brompton bikes while offering a performance level close to that of a full-featured e-bike. Whether choosing the bottle-style battery for lightweight commuting or the saddle-bag version for extended rides, users can freely customize their setup — achieving the perfect balance between convenience, endurance, and power in the era of intelligent folding mobility.

The KN / KD series brompton ebike kit adopts the hub motor design, making ebike diy remarkably simple. Riders only need to ensure the front fork spacing is 74 mm with 8 mm dropout slots, then replace it with the lvbu electric front wheel for bicycle, install the ebike kit controller and plug the swytch battery — that’s it. The process requires no frame modification, no welding, and no drilling, and it does not affect the original folding function of the bike. This is especially valuable for Brompton users who prioritize easy storage and seamless transitions between cycling and public transportation.

Through the Lvbu Smart App <WePower>, users can not only monitor speed, battery level, and riding distance, but also switch between five intelligent assist modes — Leisure, Commute, Exercise, Manual, and Climbing. The app also allows for over-speed alerts and anti-theft reporting. In addition, the ebikekit conversion system features a comprehensive Battery Management System (BMS) along with overload and temperature protection, ensuring greater safety and reliability whether for daily commutes or weekend rides.


Many Brompton users have shared positive feedback after ebike modification — climbs feel effortless, and city commuting becomes smoother and more enjoyable. One rider commented, “My Brompton has found a second life thanks to the KD40S brompton bike electric conversion kit,” while others uploaded real-life photos showing their upgraded bikes. The overall design remains sleek and balanced, with the electric hub motor blending seamlessly with the frame, achieving both beauty and functionality.

Folding bikes are no longer just compact companions for short urban rides — with intelligent lvbu e bike kits, they can become more capable and forward-thinking. The Lvbu KN / KD Series swytch bike kit offers a truly practical ebike solution that blends portability with performance: you no longer need to sacrifice foldability or convenience to enjoy effortless commuting and longer adventures. For modern city riders who value efficiency, sustainability, and lifestyle quality, this marks the next evolution of urban folding mobility.