Features 1、Made of premium aluminium alloy, hollow design, which is lightweight, adding no heaviness to bike 2、High strength and deformation resistance, durable for long time use 3、Standard accuracy machining, which ensures ultimate chain retention, increases service life, and reduces friction and noise 4、170mm crank arm length without any overlap of crank arm and chain ring bolt 5、A good replacement for bike repair, compatible with many bike models Features: 1. Made of premium aluminium alloy, hollow design, which is lightweight, adding no heaviness to bike. 2. High strength and deformation resistance, durable for long time use. 3. Standard accuracy machining, which ensures ultimate chain retention, increases service life, and reduces friction and noise. 4. 170mm crank arm length without any overlap of crank arm and chain ring bolt. 5. A good replacement for bike repair, compatible with many bike models. Specification: Material: Aluminium Alloy Color Options: Black; Silver BCD: 130 mm (suitable for 107-110mm) Arm Length: 170 mm/ 6.7 inch Fit for: pedal diameter = 9/16 The distance from the center of the plate nail to the center axis: Approx. 65mm / 2.6in Applicable bottom bracket: Approx. 107-110mm / 4.2-4.3in Weight: Approx. 555 g Package List: 1 * Pair of Crank Arms Package List