This product is suitable for retrofit folding bike, city bike, electric bike. lightweight, high axial strength and compatibility. Standard precision machining, ensure chain retention, increases service life, and reduces friction. A good replacement for bike repair and upgradation, compatible with many bike models. Crank length: 170MM Number of teeth: 46T Colour:black Material:Metal Package Contents: 1 x Crank set Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.