Compatibility and purpose Designed for BBS01, BBS02, and BBS03 middrive motors, this pinion gear is a reliable replacement part for maintenance and everyday riding. Material and build Made from strength steel for lasting durability and reliable performance during all your rides. Dimensions and compatibility options Two precise size options to fit different models: 14 mm diameter, 55 mm length 16 mm diameter, 60 mm length These dimensions ensure compatibility with BBS01, BBS02, and BBS03 setups when used as the replacement pinion. Easy replacement and installation Engineered for straightforward installation, allowing you to a damaged pinion quickly and get back on the bike with minimal downtime. What this offers Function and performance: robust steel construction supports dependable operation under typical riding conditions. Compatibility: tailored for BBS01, BBS02, and BBS03 middrive motors to meet common maintenance needs. Size options: two precise dimension variants to match model requirements. Reliability: a durable pinion gear designed to withstand regular use and extending drivetrain life. Use scenarios Routine maintenance on daily commuter bikes powered by BBS01, BBS02, or BBS03 motors to prevent drivetrain wear. Replacement after a gear wear or impact where the pinion shows signs of damage, restoring smooth shifting and pedal feel. Spare part for workshops or DIY repairs, ensuring you have the correct pinion on hand for quick service. Notes Ensure you select the correct diameter and length (14x55 or 16x60) to match your BBS01/BBS02/BBS03 setup for proper fit and performance.