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18-33 teeth double-layer helical planetary nylon gear with 686Z bearing for Bafang G310 G311 FM G311.250.D e-bike hub motor. 37mm OD, 23.5mm height, 21g, high wear-resistant nylon, direct replacement spare part for hub motor gear repair.
This professional double-layer nylon planetary gear set is a dedicated replacement spare part engineered for Bafang G310, G311 and FM G311.250.D electric bicycle hub motors. Featuring 18-tooth and 33-tooth helical gear structure with pre-installed 686Z bearing, it perfectly matches the original motor design to restore smooth power transmission and quiet riding performance.
✅ Bafang G310 E-bike Hub Motor ✅ Bafang G311 E-bike Hub Motor ✅ Bafang FM G311.250.D E-bike Hub Motor
| Parameter | Value |
|---|---|
| Gear Structure | Double-layer helical planetary gear |
| Teeth Count | 18 Teeth (inner) + 33 Teeth (outer) |
| Outer Diameter | 37mm |
| Inner Bore Diameter | 24.6mm |
| Total Height | 23.5mm |
| Large Gear Height | 12mm |
| Bearing Type | 686Z Ball Bearing |
| Single Gear Weight | 21g |
✅ Precision OEM Dimensions: 37mm outer diameter, 23.5mm total height, strictly manufactured to original specs, guarantees perfect fit for Bafang G310/G311 hub motors.
✅ 18T+33T Double-layer Helical Gear Design: Combined helical planetary gear structure delivers smoother rotation, lower running noise and optimized torque transfer for daily riding.
✅ High-strength Wear-resistant Nylon: Premium nylon material offers excellent wear resistance and shock absorption, greatly extends motor service life under continuous use.
✅ Pre-installed 686Z Bearing: Each gear comes with matched 686Z ball bearing and washers, ready for direct installation, no extra accessories required.
✅ Lightweight & Compact: Single gear only 21g, minimal added weight to your hub motor system.
Perfect spare parts for e-bike repair stores, DIY motor rebuilders and ebike wholesale distributors. Cost-effective gear kit to resolve Bafang G310/G311 hub motor gear failure issues and restore original performance.
We specialize in mid-drive motors and e-bike parts. Strict testing, powerful R&D and flexible OEM service guarantee long-term cooperation.
It used to take me weeks to hunt down hard‑to‑find e‑bike spare parts. Their compatibility‑check technical support saved me countless repair headaches. Reliable supplier I can always count on.
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We supply genuine OEM parts and premium compatible aftermarket replacement parts for e-bikes, including motor components, controllers, throttles, PAS sensors, wiring harnesses, connectors and Bosch form-factor batteries.
We serve mainstream drive system manufacturers: Ananda, Bafang, Aikema, Tongsheng, Shengyi, Bosch and more. We also provide repair components for complete e-bike brands including Sur‑Ron, Aventon, Trek and many others.
All items are brand-new and inspected before shipment. We do not supply second-hand or refurbished goods.
Our team verifies compatibility according to your bike model, motor info or original part photos. We confirm available OEM parts or recommend workable alternative solutions.
Yes. Flexible order sizes are supported, ranging from single spare parts to bulk purchases.
Sea freight, air freight and rail transport are optional.
Lead time varies by item and shipping mode. We confirm exact timelines before each order and share tracking updates.
We provide part identification, model matching and full order follow-up support.
