Feature: Type: Chain Wheel Material: Aluminum alloy Tooth pitch:12 Inch12.7mm : Bafang Compatible Motor Model:250-750W Fits For:BAFANG BBS01 BBS02 Only compatible with BAFANG BBS01 BBS02 48V 750W 500W 350W 250W Mid Drive Kit , NOT compatible with BBSHD 1000W mid motor Offset value: 46T : 6.5mm , 48T : 6.5mm , 52T : 6.5mm . If your bike is with high speed of freewheel flywheel , like > 9 speed , we recommend 42T chainring that can effectively prevent chain going off Diameter of chainring: 46T : 7.5" , 48T : 7.8" , 52T : 8.5" Chain guard: 46T 48T 52T chainring is with chain guard Made of CNC Aluminum Alloy , the bike chainring is really durable . Enjoy more torque with BAFANG premium chainring , enjoy amazing ebike cycling trip Package Includes: 1 X Chainring with cover (per your chosen option)