SHIMANO Front Chainwheel 39T 170mm with Chain Guard Black EFCS501CA9C2L ALFINE FC-S501-L (Double Guard) Included/SM-BB4600

Shimano part: EFCS501CA9C2L Number of teeth/CG/BB parts: 39T/double guard/included Crank length: 170mm Chain line: 49.2 (CT-S500)/42.7mm Color: black