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 TONGSHENG TSDZ8 750W Mid-Drive Ebike Conversion Kit offers a powerful upgrade for riders wanting to transform their regular bike into an electric one. Its 750W motor paired with a strong torque of 140 N.m and a 22ah+ controller current provides plenty of power to handle hills, long rides, and various terrains comfortably. The mid-drive design is efficient and tends to be more balanced compared to hub motors, making your ride feel natural and stable. Installation is user-friendly for most standard bikes with bottom bracket sizes of 68mm or 73mm, and the kit comes with adapter rings to ensure a secure fit across road, mountain, folding, hybrid, commuter, or cyclocross bikes.

One of the kit’s highlights is its B02N display, which gives real-time info on speed, battery level, mileage, and error alerts, making it easy to keep track of your ride without guesswork. Another plus is the flexibility to choose your own battery to match your riding style since the kit doesn’t include one, allowing customization for range and weight preferences. On the downside, because the battery is not included, there is an added cost and effort to select and install a compatible battery, which might be a bit challenging for those new to e-bike conversions. Also, weighing about 5 kilograms, the kit adds some noticeable weight to your bike, which could affect handling if you’re used to a very lightweight setup.

The 2-year motor warranty and available technical support offer peace of mind, especially if you’re new to this type of upgrade. This conversion kit represents a solid choice for riders who want a robust and flexible mid-drive electric system and are willing to invest time in installation and picking the right battery.

The LIVALL PikaBoost 2 is a rear wheel electric bike conversion kit designed for road bikes that feature round seatposts between 25-35mm. It uses a hub motor with motor power suited for casual to moderate riding, supported by a 220Wh battery offering a respectable range of up to 70 km (43 miles) under ideal conditions. This battery capacity is good for shorter commutes or recreational rides rather than long-distance travel. The kit includes a battery management system (BMS) ensuring safety and longevity, along with smart features like an app for easy installation, calibration, and mode switching. The app also allows remote troubleshooting and group ride functions, adding a modern touch to the riding experience. Charging options are flexible with both direct and removable battery charging; the system supports fast charging and even functions as a power bank for other devices.

Installation is user-friendly without extra wires and allows quick switching between electric and manual modes. However, this kit is compatible only with certain bike types—specifically not suitable for children’s bikes—and requires a 65W USB-C charger (not included). The ride quality benefits from a durable V-shape tire and safety features like automatic motor shutoff if tipping is detected to reduce accidents. The kit is lightweight and portable with a solid aluminum alloy frame for durability. A limitation is its single-speed setup, which might not suit riders needing multiple gears for varied terrain.

The included display and controller are integrated via the app rather than traditional hardware screens, which might be less intuitive for some. In summary, the LIVALL PikaBoost 2 presents a smart, safe, and convenient option for adults wanting to upgrade a compatible road bike to electric, particularly if preferring app-based control and a tidy installation. It is ideal for daily urban rides and moderate distance trips but may fall short for more demanding or off-road cycling needs.