RaceFace 1x 104 BCD Hyperglide+ Chainring - 34t, 104 BCD, 4-Bolt, Requires Shimano 12-speed Hyperglide+ Chain, 7075RaceFace Narrow Wide Hyperglide+ 1x chainrings are made of 4mm thick 7075 T6 alloy plate for stiffness and strength. Only compatible with Hyperglide + chains Designed for use with 12 speed Shimano drivetrains Narrow Wide tooth profiling ensures consistent chain retention Item Specifications Chainring BCD 104 Color Black Defined Color Black Drivetrain Speeds 12 Material Aluminum Ring Position Type Single Tooth Count 34 RaceFace Narrow Wide Hyperglide+