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 Color Black Ring Position/Type Single Tooth Count 34 Drivetrain Speeds 12 Chainring BCD 104 Material Aluminum Defined Color Black Size 34T table{border-collapse:collapse;width:100%;}td{text-align: left;padding: 8px;font-weight:350;}tr:nth-child(even){background-color:#f2f2f2}th{background-color:#eb212e;color:white;text-align:left;padding:8px;}.desc ul{font-size:24px;font-weight:600;margin-left:-25px;padding-top:35px;border-top:3px solid #f0f0f0;}.desc li{list-style:none;border-bottom:4px solid #eb212e;width:142px;}