Improved surface treatment 9speed Lighter weight Wide link design SS model compatible with compact cranksets Total capacity SS 31T Cage Length Medium or Short Drivetrain Spacing ShimanoSRAM 8 Intended Use Road ShifterRear Derailleur Shimano Largest Cog 27 Chain Wrap Capacity 37 or 29 Derailleur Action TopNormal Traditional Color SilverBlack
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