Description The 1x 64/104 BCD variable tooth chainrings are compatible with all 9, 10, 11, SRAM and Shimano drivetrains, and 12-speed SRAM drivetrains (not T-Type). Specifications 104mm Bolt Diameter Circle (104 BCD) Bottom Bracket Types: BB30 / GXP / Boost Chainline: This varies with your crankset 28T: Fits any standard 64/104BCD cranks. The 28T chainring uses 64mm BCD to mount onto the crank arm and is offset 5mm to a 49mm chainline. 30T: ~50mm on a 2×10 mid-ring mounting position 32T, 34T, 36T, 38T: ~52mm on a 2×10 mid-ring mounting position
