Bafang H640 750W Geared Hub Motor — Cassette Freehub

Brand new, OEM Bafang H640 (RM G0900.750.D/DC) geared rear hub motor — the proven workhorse engineered for eMTB, eSpeed, and high-performance e-bike conversions. Cassette freehub design (7–11 speed compatible), 80Nm of torque, and 1:5 planetary gear reduction for strong acceleration and reliable hill-climbing performance. Rated 750W | Up to 2000W peak with the HPC controller Hi-Power Cycles stocks the H640 for builders who want a clean, quiet, low-maintenance hub motor without the drivetrain wear of a mid-drive. Paired with the matched HPC controller, the H640 unlocks up to 2000W of peak output — far beyond what stock Bafang controllers deliver — making it one of the most powerful geared hubs on the market. Why the Bafang H640? 750W continuous power, up to 2000W peak when paired with the HPC high-output controller 80Nm of torque — strong enough for loaded cargo bikes, fat-tire builds, and steep climbs Cassette freehub (not freewheel) — accepts 7-, 8-, 9-, 10-, and 11-speed cassettes for modern drivetrain compatibility IP-rated waterproof construction — built to handle rain, dust, and trail conditions Quiet, smooth planetary gear reduction — far less noticeable than direct-drive hubs at low speed Genuine OEM Bafang sourced through authorized supply chain Specifications Model Bafang H640 / RM G0900.750.D/DC Rated Power 750W (48V) Peak Power (HPC Controller) Up to 2000W Max Torque 80 Nm Voltage 48V nominal (52V compatible) Max Speed 28–32 mph (depending on wheel size & controller) Weight ~5.6 kg (12.3 lbs) Dropout (OLD) 135–142 mm rear Freehub Type Cassette (7–11 speed compatible) Brake Compatibility Disc brake only Spoke Pattern 36H × 13G Wheel Sizes 26", 27.5", 700C Waterproof Rating IPX5 Gear Reduction 1:5 planetary (15T/30T/75T) Pole Pairs 10 (20 magnets) What's in the Box (1) Bafang H640 hub motor (bare hub, no wheel build) Motor cable with G11.6 connector Build Notes & Compatibility The H640 is a bare hub motor — it does not include a rim, spokes, controller, display, or battery. We can lace this hub into a custom hand-built wheel — contact us for a complete wheel build quote. For maximum performance, pair the H640 with: A 48V or 52V lithium battery rated for high continuous discharge (the HPC controller can pull serious current at 2000W peak) The HPC high-output controller — unlocks the full 2000W peak output from the H640. Stock Bafang controllers will limit you to roughly half that. A Bafang-compatible display (DP C181, DP C18, C961) or aftermarket eBike display Why Buy from Hi-Power Cycles? HPC has been building and selling high-performance electric bikes since 2008, with 20,000+ customer builds, US Special Forces and Army Corps of Engineers as verified clients, and a GSA Schedule contract (#47QSMS24D005F) for federal and military sales. Every component we sell is sourced through authorized channels and backed by real US-based technical support out of Simi Valley, California. Questions about fitment, wheel building, or pairing the H640 with our 2000W controller? Email sales@hpcbikes.com or call (818) 734-1600