General description SRAM RIVAL1 CRANK SET GXP is designed for 10 and 11-speed drivetrains, featuring a robust 172.5mm crank arm length and a 50-tooth X-SYNC chainring for optimal performance and efficiency. Technical specifications Crank arm length: 172.5mm Chainring size: 50T Compatibility: 10/11-speed drivetrains GXP cups: Not included