Crank arm length: 170mm, 172.5mm, and 175mm.Teeth: 36T.Crank material: AL-6061-T6.Crank coating: HBK.Thickness of chainring teeth: 3.4mm STEEL&PA.Coating on chainring teeth: HBK.Bottom bracket: External, with 24mm axle.Compatibility with drivetrains: 11/12/13 speed.Chain line: 49mm center-to-center distance.Q-factor, which is the distance between the crank arms at the pedal attachment point: 179mm.weight: 910g 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.