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Bafang BBS01 / BBS02 integrated big gear axle assembly, complete unit with bearing and magnetic ring. Available in 68mm,100mm,120mm lengths. OEM spec replacement shaft & gear for Bafang mid drive motor repair.
This integrated big gear axle assembly is a complete core transmission spare part for Bafang BBS01 and BBS02 mid-drive ebike motors. The assembly combines the large reduction gear, crank axle, built-in bearing and magnetic ring as one ready-to-install unit. Multiple axle length variants (68mm /100mm /120mm) are offered to match different frame bottom bracket requirements.
The magnetic ring on the gear assembly works with the motor hall sensor to detect pedal torque and rotation speed, maintaining the original pedal assist signal function. Manufactured from high-strength alloy steel, the big gear features precision-machined gear teeth for stable meshing, low noise and long service life. The integrated bearing is pre-installed at factory, saving repair shops and DIY technicians extra assembly work. Direct drop-in replacement for worn gears, bent axles, seized bearings or damaged magnetic rings on BBS01 / BBS02 mid motors.
✅ Compatible Motors: Bafang BBS01, BBS02 Mid-Drive E-bike Motors
✅ Axle Length Options: 68mm / 100mm / 120mm
✅ Assembly Includes: Big Gear + Crank Axle + Pre-installed Bearing + Magnetic Ring + Retaining Snap Ring
| Parameter | Value |
|---|---|
| Product Name | Bafang BBS01 BBS02 Integrated Big Gear Axle Assembly |
| Material | High-strength alloy steel gear & axle |
| Built-in Parts | Precision bearing + Magnetic torque sensor ring + Snap ring |
| Available Axle Length | 68mm, 100mm, 120mm |
| Application | Bafang BBS01 / BBS02 mid motor transmission repair & overhaul |
✅ Integrated Ready-to-use Assembly: Big gear, axle, bearing and magnetic ring pre-assembled as a single unit. No separate parts assembly required after opening your motor housing.
✅ Multiple Length Choices: 68mm,100mm,120mm axle options to match different bike frame bottom bracket widths.
✅ Built-in Magnetic Sensor Ring: Preserves pedal assist signal detection function, fixes no PAS signal issues caused by damaged or missing magnetic rings.
✅ Precision Alloy Steel Gear: CNC machined gear teeth for smooth transmission, reduced backlash and lower running noise under load. Resists tooth wear and chipping.
✅ Direct OEM Replacement: Matches original dimensions perfectly. Replaces failed components: worn gear teeth, bent crank axle, stuck bearing or broken magnetic ring.
✅ Time-saving Repair Part: Ideal for ebike service workshops and DIY motor rebuilders, reduces motor disassembly time during BBS01/BBS02 maintenance.
1 × Bafang BBS01/BBS02 Integrated Big Gear Axle Assembly (selected length: 68mm /100mm /120mm)
Complete transmission rebuild spare part for Bafang BBS01 & BBS02 mid-mounted ebike motors.
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.
