Geared rear hub motors with a cassette interface instead of a threaded freewheel — the right
choice for modern frames and drivetrains, where 8-9 speed cassettes, wider dropouts and disc
brakes are standard. Three power classes cover commuters through 750W trekking builds.
These are wholesale, quote-only motors. Tell us your frame’s dropout width, cassette speed
count and target power and we’ll confirm the matching model and pricing.
Models & specifications
| Model | Voltage | Rated power | Reduction | Dropout | Cassette | Wheel sizes | Weight | Top speed |
|---|
| GDC-08 | 36V/48V | 250W | 1:4.4 | 145mm | 8-9s | 16”-28” | 3.0 kg | 25-28 km/h |
| GDC-15 | 36V/48V | 250-500W | 1:5 | 145mm | 8-9s | 16”-28” | 3.9 kg | 25-40 km/h |
| GDC-19 | 36V/48V | 500/750W | 1:5.8 | 142mm | 8-9s | 20”-28” | 5.0 kg | 25-45 km/h |
All models: IP54 waterproof rating, ≥78% efficiency, -20 °C to 45 °C operating range,
24/96h salt-spray tested, V-brake and disc-brake compatible, shaft cable exit.
Highlights
- Modern drivetrain fit: true cassette spline takes standard 8-9 speed cassettes — no threaded freewheel compromises.
- Torque-dense: planetary reduction delivers strong hill-climbing assist without direct-drive weight.
- OEM-ready range: 250W commuter through 750W trekking classes from one motor family.