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18T+33T Nylon Double Helical Gear with 686Z Bearing, Replacement for Bafang FM G320 FM G310 FM G311 & Vinka FH30i 250W Inner-Rotor Hub Motor
18T+33T Nylon Double Helical Gear with 686Z Bearing, Replacement for Bafang FM G320 FM G310 FM G311 & Vinka FH30i 250W Inner-Rotor Hub Motor - Image 2
18T+33T Nylon Double Helical Gear with 686Z Bearing, Replacement for Bafang FM G320 FM G310 FM G311 & Vinka FH30i 250W Inner-Rotor Hub Motor - Image 3
18T+33T Nylon Double Helical Gear with 686Z Bearing, Replacement for Bafang FM G320 FM G310 FM G311 & Vinka FH30i 250W Inner-Rotor Hub Motor - Image 4
18T+33T Nylon Double Helical Gear with 686Z Bearing, Replacement for Bafang FM G320 FM G310 FM G311 & Vinka FH30i 250W Inner-Rotor Hub Motor - Image 5

18T+33T Nylon Double Helical Gear with 686Z Bearing, Replacement for Bafang FM G320 FM G310 FM G311 & Vinka FH30i 250W Inner-Rotor Hub Motor

18T+33T nylon double helical gear with pre-fitted 686Z bearing. Replacement spare for Bafang FM G320/FM G310/FM G311 & Vinka FH30i 250W inner-rotor geared hub motor.

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18T+33T Nylon Double Helical Gear with 686Z Bearing for Inner-Rotor Geared Hub Motor

This high-strength nylon compound double helical gear is dedicated replacement spare part for 250W inner-rotor geared hub motors. It comes pre-installed with 686Z bearing, used to replace worn or damaged original gear inside hub motor gearbox, restoring quiet and stable power transmission for your e-bike front hub motor.

Compatibility

✅ Bafang hub motor models: FM G320.250.W, FM G310, FM G311

✅ Third-party compatible motor: Vinka FH30i inner-rotor geared hub motor

⚠️ Important fitment reminder: This gear uses shared public-mold geometry. Even motors with similar appearance, physical dimension checking is strongly recommended before purchase. Not all look-alike inner-rotor hub motors are guaranteed to fit.

Precise Specifications

ParameterValue
Product Name18T+33T Nylon Double Helical Compound Gear
MaterialHigh‑strength Nylon
Gear Teeth18T small gear +33T large gear, helical tooth
Built-in Bearing686Z Bearing pre-installed
Overall Outer Diameter37mm
Small Gear Outer Diameter24.6mm
Total Gear Height18.5mm
Applicable Rated Power250W inner‑rotor geared hub motor

Package Includes

1 × 18T+33T Nylon Double Helical Gear (with pre-installed 686Z bearing)

Key Features

✅ Exact OEM-Spec Compound Gear: Manufactured strictly to original gear dimensions, direct drop-in replacement for Bafang FM G320/G310/G311 and Vinka FH30i hub motors, no modification required.
✅ Pre-installed 686Z Bearing: 686Z bearing already fitted inside the gear, saves your assembly time during motor overhaul.
✅ Double Helical Nylon Structure: 18T+33T helical tooth design provides smooth power transfer, reduces running noise and vibration during daily e-bike riding.
✅ Durable High-Strength Nylon: Excellent shock absorption and wear resistance, extends hub motor service life.
✅ Practical Repair Spare: Perfect solution for fixing hub motor grinding noise, power slipping, power cut-off caused by broken or aged original gear.

Specifications

Brand: Aftermarket spare part

Product Name: 18T+33T Nylon Double Helical Gear with 686Z Bearing

Material: High‑strength Nylon

Gear Teeth: 18T + 33T helical compound gear

Bearing: Pre-installed 686Z bearing

Dimensions: OD 37mm; small gear OD 24.6mm; height 18.5mm

Compatible Motors: Bafang FM G320.250.W, FM G310, FM G311; Vinka FH30i inner‑rotor hub motor

Applicable Power:250W geared inner‑rotor hub motor

Color: As shown in the picture

Package:1 × Nylon compound gear with 686Z bearing

Important Notes

⚠️ Critical pre‑purchase check: This is a public‑mold aftermarket spare. Similar‑looking hub‑motor appearance cannot guarantee fitment. Please cross‑check your original gear physical dimensions before placing the order. Only fits the confirmed listed motor models.
Minor color differences may appear due to lighting conditions and screen display variations.

Allow measurement tolerance of ±0.1~0.3mm.

Only the listed nylon gear with 686Z bearing is included; other motor accessories shown in reference images are not part of package.
Great cost‑effective overhaul spare for ebike repair workshops, DIY motor rebuilders and ebike wholesale distributors, to resolve gear failure and restore original hub‑motor performance.
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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.

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