Fat bikes need serious torque to spin 4-5" tires through snow and sand. Here are the kits we recommend for fat bike conversions.
Fat bike conversions are pure adrenaline — a 1000W mid-drive on a fat bike can power through snow, sand, and soft terrain that would stop a regular bike dead. The challenges are unique though: 100mm bottom brackets, heavy wheels, and the need for serious low-end torque.
Most BAFANG mid-drive kits offer 100mm and 120mm BB variants specifically for fat bikes. Standard 68-73mm kits will NOT fit a fat bike. Make sure you order the correct BB length.
Our Picks
BAFANG BBS02B/BBS-HD Mid Drive Kit (750W/1000W)
★★★★½ 4.6- Power750W / 1000W
- Voltage48V / 52V
- Torque120-160 N·m
- Price$399 - $549
The industry benchmark for DIY mid-drive conversions. The BBS02 (750W) is the sweet spot for power and reliability; the BBSHD (1000W) is the bulletproof choice for hardcore builds.
BAFANG Mid Drive Kit (500W/750W/1000W Options)
★★★★½ 4.6- Power500W / 750W / 1000W
- Voltage48V / 52V
- Torque100-160 N·m
- Price$379 - $529
Newest BAFANG mid-drive listing with updated throttle-responsive acceleration. Offers all three wattage options in one product page.
Final Thoughts
A converted fat bike is the ultimate all-terrain vehicle — snow, sand, mud, nothing stops it. Get the BBSHD 1000W in 100mm BB variant, pair with a 48V 20Ah battery, and you'll be riding through conditions that ground other cyclists.