This product is suitable for retrofit folding bikes, city bikes, and electric bikes. Lightweight with high axial strength and broad compatibility. Features standard precision machining, chain retention design to increase service life and reduce friction. A reliable replacement option for bicycle repair and upgrade, compatible with various bike models. 170mm crank arm length ensures no overlap between crank arm and chainring bolt. Specifications: 48T BCD double chainring x 170mm handle with square taper bottom bracket, includes 9/16-inch pedal axle and chain cover. Compatibility: Designed for use with 6-speed and 7-speed rear derailleurs. Installation recommendation: Suitable for use on bicycles including those with lithium battery setups. Color: Black Material: Aluminum alloy Package Contents: 1 x Crank Set Note: Other products are not included. Lighting and display differences may cause slight variations in color between the image and the actual item. Measurement allows an error of +/- 1-3 cm.