SRAM offers its Powerglide Inner Road Chainring, ideal for both road and 'cross riding, in myriad sizes to humor our impulses and account for whatever a given race throws our way. The SRAM Inner Chainring - Road is available in 110 or 130 millimeter BCD (Bolt Circle Diameter) with 34, 36, 38, 39, 42, or 46 teeth. Please note that this ring is only 10-speed compatible.