The XX T-Type derailleur mounts around the wheel axle itself, contacting the cassette directly with a first-of-its-kind Hangerless Interface. The Full Mount attachment method creates a far stronger connection and grips both sides of the frame. A tucked-in profile houses replaceable skid plates that enhances dependability in high-pressure racing environments. To further its performance, the lower pulley called Magic Wheel keeps spinning if an object becomes lodged.Hangerless Interface, Full Mount attachment method (UDH compatible frame required)Install and pair via the reliable and familiar standard AXS set-up and pairing procedure.Chain Management Features. Magic Wheel. Overload Clutch. Replaceable skid plates.Battery Not IncludedSRAM Model ID: RD-XX-E-B1 TECH SPECS Minimum Cog 10T Speed 12 Maximum Cog 52T Primary 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;}