1. 45Tpaired with a 170mm crank arm, this Bicycle Square Hole Crankset is designed for precision. 2.The 130mm BCD ensures compatibility with Folding Bike setups. 3. Crafted from high-strength aluminum alloy, this Bicycle Square Hole Crankset combines durability with design. 4. The crank arm length of 170mm is meticulously designed to prevent any overlap with the chainring bolt, enhancing the efficiency and comfort of your ride. Perfect for upgrading your bike's performance. 5. Specifically fits folding bike this Bicycle Square Hole Crankset is engineered for those who demand reliability and strength in their bicycle components. Arm Length: 170mm BCD: 130mm Teeth:45T Colour: Red Material: Aluminum Alloy Package Contents: 1 set of folding bicycle square hole cranks 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.