£14.90
Steel first-stage reduction pinion for the Bafang BBS01/BBS02 (10mm-shaft “G1” generation). Bafang’s newer “G2” motors use a 12mm-shaft pinion that isn’t interchangeable, even though the outside model markings don’t show the difference — confirm your generation first.
For any order above £19.90 shipping is free of charge.
You have the right to return your orders within 30 days.
12 months warranty from date of purchase.
First-stage reduction pinion · Steel · Old (G1) vs. new (G2) version split — confirm your generation first
The pinion mounts directly on the motor’s fast-spinning output shaft and forms the first stage of the internal reduction gear train — it’s what meshes with the large nylon reduction gear that actually brings motor RPM down into a usable torque range at the crank. Wear here is often accompanied by wear on the mating nylon gear, since the two parts run directly against each other.
This is a real, well-documented compatibility split that Bafang never reflected in external model names. The “old version” G1 pinion has a 10mm shaft and mates with a nylon gear that has a single row of needle bearings; the “new version” G2 pinion has a 12mm shaft and mates with a nylon gear with three rows of needle bearings and a smaller bore. A G2 gear’s smaller bore will not physically seat on a G1 pinion’s shaft. Since Bafang didn’t change the outside labelling, the only sure way to identify which you have is to open the motor and measure the shaft — this listing is for the G1 (10mm) version.
Fits the BBS01 250W kit and BBS02 750W UART kit (older/G1 generation). Since this meshes directly with the nylon reduction gear, it’s worth inspecting both at the same time if either shows wear.
Every Pinion purchased from All4eBikes is covered by a 12-month warranty against manufacturing defects, alongside a 30-day return window.
Send us a photo once the case is open, or describe your motor’s age/purchase date, and we’ll help confirm G1 vs G2.
📍 2 Beresford Road Lane, Roath, Cardiff CF24 1QU | 📞 07920 781 258
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