Crank arm length: 170mm, 172.5mm, and 175mm.Number of teeth on chainring: 48/31T.Crank material: AL-6061-T6.Crank coating: HBK.Thickness of chainring teeth: 2mm STEEL&PA.Coating on chainring teeth: HBK.Bottom bracket: External, with 24mm axle.Compatibility with drivetrains: 10/11 speed.Chain line: 47mm center-to-center distance.Q-factor: 151mm.Weight: 860g. We apologize for the inconvenience, but at the moment, we do not offer sales of this product to individual consumers. However, we do have options for B2B sales and would be happy to assist you through our offline business team. You can reach them at sales@wheeltop.com for further information.