Precise wireless Di2 shifting designed for E-MTB and LINKGLIDE compatibility. The ultra-durable RD-M9260 long-cage rear derailleur delivers features all riders can appreciate. The derailleur taps into the same wireless Di2 shifting technology and other strengths of XTR while pulling power from the bike&&';;s main battery delivering a stable power supply and eliminating the need for a back-up battery The wide link structure skid-plate design durable carbon plate and solid pulley add robustness and derailleur longevity while the new slim stabilizer design keeps the whole system quietRD Protection Function: The new Automatic Impact Recovery function instantly returns the derailleur to its original position after impactLINKGLIDE Compatible: Added derailleur durability combined with a LINKGLIDE cassette extends the drivetrain&&';;s lifespanAUTO SHIFT E-Bike Technology: Intelligent AUTO SHIFT sensors and LINKGLIDE technology provide smooth quick gear changes while you pedal so you&&';;re always in the right gearFREE SHIFT E-bike Technology: Keep your speed while the system automatically shifts as you coast or descendSHIMANO SHADOW ES: Shimano&&';;s pioneering chain-stabilizing technology is back and better than ever offering a slimmer stronger chain management evolution of the SHADOW concept 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 51 Rear Derailleur Mount Type Shimano Rear Direct Mount Drivetrain Speeds 12 Chain Wrap Capacity (teeth) 41 Cage Length Long Color Black/Silver Designed for ebike Yes