Use: Cruisers, fits on road, mountain, fixed-gear, BMX, track, and single-speed bikes Crank Length: 170 mm Material: Aluminium alloy-6061 Standard Bolt Circle Diameter (B.C.D): 130 mm (5.12 inch) Key benefits - Broad compatibility across multiple bike types due to the 130 mm B.C.D, enabling use with common 5-bolt chainrings on cruisers, road, mountain, fixed-gear, BMX, track, and single-speed bikes - Standard 170 mm crank length suits a wide range of riders and riding styles, providing balanced pedaling leverage - Durable, lightweight construction from Aluminium alloy-6061 supports reliable performance under typical riding conditions - Clear specification set supports easy part matching and replacement without surprises Use scenarios - Scenario 1: Upgrading an older road or mountain bike by replacing a worn crank with a 170 mm crank that accommodates standard 5-bolt chainrings, restoring pedaling efficiency and leverage - Scenario 2: Converting a fixed-gear or track bike to a common 5-bolt chainring setup, leveraging the 130 mm B.C.D for broad chainring compatibility while maintaining a 170 mm crank arm - Scenario 3: Replacing a worn or incompatible crank on a cruiser or single-speed bike with a standard 130 mm B.C.D crank, supporting easy access to replacement chainrings and parts Notes - Compatible with bikes that use a standard 5-bolt chainring mounting pattern - No additional components described; verify compatibility with your existing drivetrain and frame before installation