This chainring from E*thirteen fits on Shimano motors and is compatible with a wide range of drivetrains, including Shimano 12 speed, SRAM Eagle, and SRAM T-Type. Direct Mount chainring for a variety of E-Bike fitment Updated M3 narrow-wide tooth profile eliminates chain noise, and decreases overall system wear while retaining chain An alloy outer dust cover helps to prevent contamination 11/12 speed. Compatible with both Shimano and SRAM 12 speed drivetrains 53mm chainline to support dropping a chainring size to take advantage of e*thirteen 9t cassette cog TECH SPECS Model Helix R E*spec 21mm Offset Ring Type Single (Anti-Chain Drop) Mount Shimano EP8 Teeth 34 Oval/Round Round Color Black 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;}