<p>This product is suitable for retrofit folding bike, city bike, electric bike. </p> <p>lightweight, high axial strength and compatibility. </p> <p>Standard precision machining, chain retention, increases service life, and reduces friction. </p> <p>A good replacement for bike repair and upgradation, compatible with many bike models. </p> <p>170mm crank arm length without any overlap of crank arm and chain ring . </p> <p> </p> <p>Specifications: 48TBED double cover x 170MM handle square hole, with 9\/16inch pedal axle, chain cover, </p> <p>Introduction: Compatible with 6\/7 speed post change, installation recommendation: suitable for trendy lithium battery\/bicycle type lithium battery\/bicycle etc. </p> <p>Colour: black </p> <p>Material: aluminum alloy </p> <p> </p> <p>Package Contents: </p> <p>1 x Crank set </p> <p> </p> <p>Only the above package content, other products are not included. </p> <p>Note: Light 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. </p>