M-series rear derailleurs are designed to work with 8 and 9-speed Shimano-compatible mountain and road shifters. Marvo LT rear derailleurs are made in precision rigid aluminum construction. Let these miracle workers get any bike rolling again. FEATURES : Lightweight aluminum construction Steel pulley cage for extra chain-rub durability Compatible with Shimano 8 and 9-speed mountain and road systems SPECS : Color: Black Largest Cog: 36 Rear Derailleur Mount Type: 10x1 Standard Chain Wrap Capacity (teeth): 45 Cage Length: Long Rear Der/Shifter Compatibility: Shimano Mountain Drivetrain Speeds: 8 , 9 Weight: 317