RaceFace 1x 104 BCD Hyperglide+ Chainring - 32t 104 BCD 4-Bolt Requires Shimano 12-speed Hyperglide+ Chain 7075 Aluminum BLKRaceFace 1x 104 BCD Hyperglide+ Chainring 32t 104 BCD 4 Bolt Requires Shimano 12 speed Hyperglide+ Chain 7075 Aluminum Black. RaceFace 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 TECH SPECS Ring Position Type Single Tooth Count 32 Round