Sunrace RD-R91 9 speed silver rear derailleur Model=950/9 Hex-Plus L-Key Set Rings 50/37Number of Chainrings DoubleDrivetrain

Rings 50/37Number of Chainrings DoubleDrivetrain Speeds 12Chainring BCD Direct Mount SRAM 8-BoltChainline/Hub Compatibility 135/142 Road Disc Hubs < 415 mm ChainstayChainline/Hub Compatibility 135/142 Road Disc Hubs > 415 mm ChainstayColor CarbonCrank Length (mm) 165Crank Intended Use RoadBB Included NoPedal Spindle 9/16"Spindle Interface Type SRAM DUBDefined Color Carbon

42t:  Improved by 53%

} Wide: 55mm chainline for 157mm rear spacing

8-12sp chain tool

Sunrace RD-R91 9 speed silver rear derailleur Model=950/9 Hex-Plus L-Key Set Rings 50/37Number of Chainrings DoubleDrivetrain9 speed road rear derailleur. High polished aluminum outer link. Composite aluminum and steel construction. SHIMANO Equivalent RD 3500 TECH SPECS 9sp 28 33 Short 2to1 SIL 257g