SRAM Rival 1x Crankset Riding Rival Featuring forged aluminum arms and SRAM's game-changing X-Sync chainrings, this crankset hits the sweet spot between weight, durability, and performance. Features X-Sync chainrings are compatible with SRAM 11 and 10-speed chains45. 5mm chainline is compatible with 130 or 135mm spaced rear dropouts Q-factor for GXP cranks is 149. 6mm, Q-factor for BB30 is 147. 4mm Chainring spider is removable SPECIFICATIONSSpeeds10/11BB Compatibility BB30/PF30Chain Ring42TCrank Arm Length170, 172. 5, 175mm BB Spindle Interface BB30, PF30Chainring Material Aluminum Bolt Center Diameter (BCD)110mm Crank Arm Material Aluminum Chainline45. 5mm Bottom Bracket Included No Intended Use Road, Gravel Weight N/A | Sram | Rival 1X Crankset 172. 5Mm 42T | Aluminum