Shimano M3100 Alivio 9 speed Rear Derailleur This rear mech is engineered for MTB riding, as it offers crisp performance on every ride. It features Shimano's Shadow design with a smooth skid plate surface and a super low profile alloy design that reduces the risk of damage from trail side hazards. This makes it more than capable of handling all the abuse that's associated with all-day epics in the mountains. Coming complete with a wide link design, it increases rigidity and service life.Features: Body Material: Alloy Use: MTB Speed: 9 speed Size: Long Cage Type: Rear Links: Wide links Pulleys: 11T pulleys Low Sprocket Compatibility: 32 to 36TMax Capacity: 45TSwing: Normal top-swing design Profile: Low profile Compatibility: Compatible with 9 speed Hyperglide sprockets Single or Pair: SinglePart Number: RDM3100SGSTechnologies: Shadow: Shadow design with smooth skid plate surface features a super low profile design that reduces the risk of damage from trail side hazards. Wide Link: Wide link design for greater torsional rigidity improves shifting response and service life.A 2-year warranty is offered with all Shimano products from Chain Reaction Cycles (3 years on Dura-Ace and XTR products).Buy Shimano Components from Chain Reaction Cycles, the World's Largest Online Bike Store.