Designed to fit Shimano XTR M9100 , M9120, XT M8100, M8120, M8130 , SLX M7100, M7120, M7130 and FC-MT900 cranksets Works ONLY with CN-M9100, 8100 & 7100 chain Oval rings help the rider to spin smoother and more efficiently 32t is equivalent to 30t at dead spot and 34t at the power zone Narrow-wide tooth profile keeps the chain snug, allowing you to leave the chain guide behind Designed in UK, manufactured in Poland TECH SPECS 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 .specs-heading{font-size:24px;font-weight:600;padding-top:35px;border-top:3px solid #f0f0f0;display:inline-block;border-bottom:4px solid #eb212e;width:142px;margin:0;} Model XTR M9100 Ring Type HG+ (Anti-Chain Drop) Mount Shimano DM Teeth 28 Oval/Round Oval Color Black