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BBS Chainwheel Core Data: ★Suitability----Bafang Mid BBS Motor: MM G340 ★ Teeth Number----44T/46T/48T/52T ★ Chain Line----50 ★Thickness----3/32" ★ Chain Wheel Material----SPCC ★Guard Material----Plastic PP BBSHD Chainwheel Core Data: ★Suitability----Bafang Mid BBSHD Motor: MM G320 ★ Teeth Number----42T/44T/46T ★ Chain Line----42T/44T:60(68);62.5(73);71(90);76(100);81(110);86(120); ----46T:50(68);52.5(73);61(90);66(100);71(110);76(120) ★Thickness----3/32" ★ Chain Wheel Material----SPCC ★Spider Style----42T/44T:5(§130) Attention:there are two kinds of chain wheel (BBS and BBSHD), please pay attention to the color name when you are going to order it.