The Shimano XTR M9100 is designed to withstand full force pedalling on the roughest trails with smooth shifting and exceptional chain stability. It offers enhanced shifting performance a low profile design and low sprocket compatibility.Designed with a Shadow RD+ clutch to reduce chain slap and create a quiet drivetrain with less distractionDecreased rear derailleur tension at low gear positions prevents high chain tensionFeatures a larger 13-tooth pulley 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;} Largest Cog 45 Color Gray Rear Der/Shifter Compatibility Shimano Mountain Rear Derailleur Mount Type 10x1 Standard Drivetrain Speeds 12 Weight 237 Chain Wrap Capacity (teeth) 35 Cage Length Medium Cage Size Medium