Shimano Alivio Shadow Rear Derailleur (9-speed)
Shimano's Alivio Shadow Rear Derailleur is built to withstand the rigors of off-road riding, with a lightweight aluminum body and low-friction pivots for incredibly easy and smooth shifting. And, the Alivio features 11-tooth pulleys, which alternate chain-link contact to reduce wear and smooth pedaling.
• Cage Length: Long
• Chain Wrap Capacity (teeth): 45 teeth
• Color: Gray
• Drivetrain Speeds: 9
• Largest Cog (teeth): 36
• Rear Der/Shifter Compatibility: Shimano Mountain
• Rear Derailleur Mount Type: 10x1 Standard , Shimano Rear Direct Mount
An important part of a rear derailleur's job is keeping the chain taut as you change gears. Chain-wrap capacity is a number that tells whether or not a derailleur will be able to do this on the drivetrain you plan to use it on. Calculate chain-wrap capacity with this formula: Chain-wrap capacity = (large chainring - small chainring) + (large rear cog - small rear cog). Example: 44/29 chainrings and a 11-28 cassette: (44 - 29 = 15) + (28 - 11 = 17) = 32-tooth chain-wrap capacity.