Description Specifications: Type: Sprocket Material: Aluminum Alloy Tooth Pitch: 1/2 inch/12.7mm Brand: Bafang Compatible Motor Model: 250-750W Fit for: BAFANG BBS01 BBS02 Features: Only compatible with BAFANG BBS01 BBS02 48V 750W 500W 350W 250W Mid Drive Kit, NOT compatible with BBSHD 1000W Mid Drive Motor Offset Value: 36T: 0.5mm, 42T: 16.5mm, 44T: 6.5mm, 46T: 6.5mm, 48T: 6.5mm, 52T: 6.5mm. If your bike has a high speed freewheel/flywheel, such as 9 gears, we recommend a 42T chainring, which can effectively prevent the chain from jumping off. Chainring diameter: 36T: 5.98 , 42T: 7.07 , 44T: 7.1 , 46T: 7.5 , 48T: 7.8 , 52T: 8.5 Chain guard: 42T 44T 46T 48T 52T chainring with chain guard, 42T without chain guard The bike chainring is made of CNC aluminum alloy and really durable. Enjoy more torque with BAFANG premium chainring and enjoy a fantastic e-bike cycling trip Package includes: 1*Chainring with cover (depending on the option you choose)