SRRM03 Torque Sensor Hub Motor Kit

The SRRM03 rear wheel hub motor is a cost-competitive power solution for electric bicycle OEM, ODM and aftermarket e-bike conversion projects. Designed specifically for bicycle rear wheel installation, this ebike hub motor works under 36-48V voltage, delivers solid 55 N.m torque with 135W rated power, and achieves over 80% efficiency to maximise battery riding range.

Weighing only 3.5 kg, this rear hub motor features IP54 waterproof protection to handle daily outdoor wet-weather riding. It adopts 36-hole 12G/13G mounting structure and supports 6/7-speed spin-on freewheel. Built to match standard bicycle rear dropout dimensions for straightforward assembly onto regular bike frames.

Equipped with robust 3+7-pin waterproof connector for stable power and signal transmission. The motor housing comes with durable black spray-paint finish. CE and RoHS certified to satisfy international safety-quality standards.

Thanks to its proven mechanical design, the SRRM03 rear wheel hub motor brings strong cost advantages. It is widely used on city commuter e-bikes, leisure electric bikes and DIY e-bike retrofits. Whether you source in bulk for e-bike production or need replacement hub motor for conversion kits, SRRM03 is your reliable choice.

✅ 36-48V wide-voltage input, 55Nm powerful torque output

✅ ≥80% high working efficiency for longer riding range

✅ IP54 waterproof rating for daily outdoor use

✅ 3.5kg lightweight rear-hub construction

✅ Support 6/7-speed spin-on freewheel, 36-hole 12G/13G mounting

✅ 3+7 waterproof connector for stable connection

✅ CE & RoHS certified, reliable quality

✅ Cost-effective for e-bike OEM, ODM & conversion kits