10 Best Electric Bicycle Conversion Kits 2025 in the United States

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.

The Bafang 1000W Mid Drive Kit is a strong choice if you want to convert a regular bike into a powerful electric one, especially suited for mountain, road, fat, or commuter bikes. Its motor delivers impressive strength with 1000 watts and up to 160 Nm torque, meaning it can help you climb hills easily and reach speeds over 30 mph on flat terrain. The kit is versatile, fitting most bikes with common bottom bracket sizes, and it comes with all the main accessories you need, including a display, throttle, brake sensors, and chainring. Installation is made easier with a helpful video guide, and you can switch between three riding modes – full electric, pedal assist, or push assist – depending on how much you want to pedal.

The kit runs on a 48V or optional 52V system, providing good battery power for longer rides, though the battery itself is sold separately. Made with aluminum, it weighs about 6 kilograms, which is reasonably light for a mid-drive motor. This kit may require some mechanical know-how or assistance during installation if you’re new to bike upgrades. Also, while the motor is very powerful, such high power can exceed the needs of casual riders and potentially reduce battery range if used extensively at full throttle. Customer support is a plus, with warehouses in several countries and a one-year warranty offering peace of mind. This kit is suitable for those looking for a robust and flexible electric bike solution to upgrade various bike types, particularly if strong hill-climbing power and fast speeds are desired.