10 Best Electric Bicycle Conversion Kits 2026 in the United States

The Varstrom 2024 Tongsheng TSDZ2B mid motor kit is a solid choice for anyone looking to convert a bike with a 68-73mm bottom bracket into an electric bike. It features a 48V 500W mid-drive motor, which provides strong assistance up to speeds around 45 km/h, making it suitable for commuters and casual riders who want reliable power without losing the feel of pedaling. One of its standout features is the torque sensor, which adjusts the motor’s help smoothly based on how hard you pedal, giving a natural riding experience similar to a regular bike.

The latest model also supports various displays, allowing you to customize your ride info, and includes helpful components like throttle and brake levers. The kit has been improved with a dual-clutch system to reduce resistance when pedaling without power, and a redesigned motor shaft that enhances durability. However, it weighs about 7 kg, which might add noticeable heft to the bike, and its compatibility is limited to bikes with that specific bottom bracket size and chain drive systems, so it’s not a fit for every bike.

The kit comes with a one-year warranty for repair or replacement, which is reassuring. For those who have a compatible bike and want a high-quality, smooth electric assist, this kit offers a practical and well-designed option, especially for riders who appreciate a mid-drive setup with torque sensing.

The BAFANG 48V 750W Electric Bike Conversion Kit is a powerful option for converting a regular bike into an electric one. The mid-drive motor offers 750W of power, which provides a significant boost and can reach speeds up to 40 km/h, making it suitable for both commuting and leisure rides.

The kit includes a C18 display, a thumb throttle, and a 44T chainring, allowing users to monitor and control their ride easily. The battery has a substantial capacity of 15Ah and offers a range of up to 80 km, which is quite impressive for long-distance travel. Additionally, it features two riding modes: e-bike and pedal support, giving users flexibility depending on their needs.

The compatibility with disc brakes enhances safety and driving comfort. At 6.99 kilograms, it might add considerable weight to the bike, which could be a concern for some users. Assembly is required, which might be a bit challenging for those not mechanically inclined. The kit's higher power might be overkill for casual riders, making it ideal for those looking for a robust solution to convert their bike into an e-bike and enjoy a mix of physical exercise and powered assistance.

The Bafang Mid Drive Kit (models BBS02B and BBS-HD) is a versatile electric bike conversion kit compatible with bottom brackets between 68-73mm and suitable for various bike types including mountain bikes, city bikes, and recumbent trikes. It offers motor power options of 500W, 750W, and 1000W, powered by a 48V or 52V system, delivering strong torque ranging from 100 to 160 Nm. This allows the bike to tackle hills and different terrains with speeds up to 45 km/h.

The kit includes most necessary components such as brake levers, chainwheels, throttle, speed sensor, and installation tools. However, the battery and LCD display are optional and must be purchased separately, which is important to consider for those seeking a complete setup immediately. Installation is designed to be beginner-friendly, supported by manuals, online videos, and US-based customer support to assist if needed.

There are some limitations, including the requirement for specific bottom bracket sizes and compatibility only with bikes that have disc or V-brakes and chain drives, so it may not fit all bicycles. Additionally, 73mm screws are not included, which may entail extra cost or effort. For users comfortable with some DIY assembly, this Bafang kit provides powerful and customizable performance along with reliable support, provided the bike’s compatibility and battery purchase are carefully planned.