10 Best Electric Bike Conversion Kits 2025 in the United States

The BAFANG Mid Drive Kit is a versatile electric bike conversion kit available in 500W, 750W, and 1000W variants, making it suitable for a range of power needs. The motor offers strong torque (up to 160N.m) and can reach speeds up to 45KMH, which is ideal for various terrains including mountain trails and city streets. It supports multiple riding modes: throttle, pedal assistance, and standard cycling, allowing customization based on preference and situation.

The kit includes comprehensive accessories such as brake levers, chain wheel, thumb throttle, speed sensor, headlight, bottom bracket removal tool, and an optional battery and LCD display, ensuring most components are covered for a complete setup. Compatibility is broad, fitting most bikes with bottom brackets of 68-73mm, 100mm, and 120mm lengths, adhering to JIS standards, but it's limited to disc or V-brake equipped, chain-driven models only.

Installation is simplified with manuals and video resources, plus tools like a wrench and crank removal tool included, although the battery must be purchased separately. The aluminum material ensures durability, and the product comes with reliable tech support and a solid warranty (30 days return, 365 days repair or replace). The kit’s complexity might be a concern for those new to bike conversions, and the absence of 73mm screws requires additional effort to obtain if needed. This kit is best suited for users looking for a robust and customizable electric bike solution with a decent level of mechanical skill for installation.

The EBIKELING Waterproof Ebike Conversion Kit is a solid choice for those wanting to upgrade their bike into a powerful electric ride, especially if you have a 24-inch rear wheel bike. It features a 1200W direct drive motor, which provides strong assistance suitable for hilly terrain or faster commuting. The kit is waterproof, making it dependable in various weather conditions, which is a plus for everyday riders. Compatibility-wise, it supports several brake types including disc and caliper, and it's designed to fit aluminum or carbon steel frames, so it works well with many common bike builds.

This kit includes most of the essential parts you need—motor, controller, display, throttle, brake levers, pedal assist system, and even a torque arm—making the installation more straightforward than sourcing parts separately. However, the battery and tire are not included, so you'll need to purchase those separately, which adds to the cost and setup time. The total weight is about 14.7 pounds, which is reasonable but may add some heft to your bike.

The pedal assist system is designed to integrate smoothly with your pedaling, giving a natural boost without feeling jerky or delayed. The installation requires some mechanical know-how but is manageable if you follow instructions carefully; beginners might want to seek help. Warranty coverage is limited—1 year on the motor and battery, but only 3 months on other parts—so keep that in mind. This kit offers a powerful, weather-resistant upgrade for riders wanting a robust electric bike conversion with flexible control options, best suited for those comfortable with a moderate installation process and ready to invest in a separate battery. It is ideal for a reliable, strong motorized ride for daily use or hilly routes.

The TONGSHENG TSDZ8 750W Mid-Drive Ebike Conversion Kit offers a solid upgrade for those wanting to transform their standard bike into an electric one. Its mid-drive motor provides strong power (750W) and high torque (140 N.m), which helps with climbing hills and riding over various terrains. This kit is compatible with most bikes that have a bottom bracket size of 68mm or 73mm, covering a wide range of road, mountain, and commuter bicycles. Installation is fairly straightforward, thanks to included adapter rings and washers to ensure a secure fit. The included B02N display gives you real-time info like speed, battery level, and distance, making your ride feel more connected and easier to manage.

It is important to note that the kit does not include a battery, so you will need to select and purchase a compatible battery separately, which may add to the overall cost and complexity. Weighing 5 kilograms, it is relatively light for a mid-drive motor, so it shouldn't make your bike feel too heavy.

The 2-year motor warranty and local technical support provide reassurance for buyers. This kit suits riders who want a customizable electric bike experience and are comfortable with some DIY installation and battery selection. For those who prefer a fully assembled e-bike or a complete all-in-one kit including the battery, this product might require additional effort.