SRAM -
SRAM Red Rear Derailleur - 10 Speed, Short Cage, Black/Silver Top-of-the-line rear derailleur with generous use of carbon fiber and titanium for maximum performance at minimal weight. Carbon fiber and aluminum construction Ceramic bearing pulleys Titanium hardware Compatible with other SRAM 10-speed drive train components Color: Black/Silver Largest Cog: 28 Rear Derailleur Mount Type: 10x1 Standard Chain Wrap Capacity (teeth): 33 Cage Length: Short Rear Der/Shifter Compatibility: SRAM Exact Actuation Drivetrain Speeds: 10 Weight: 145 SRAM Red WiFli Rear Derailleur - 10 Speed, Medium Cage, Black/Silver Top-of-the-line rear derailleur with generous use of carbon fiber and titanium for maximum performance at minimal weight. Carbon fiber and aluminum construction Ceramic bearing pulleys Titanium hardware Compatible with other SRAM 10-speed drive train components Color: Black/Silver Largest Cog: 32 Rear Derailleur Mount Type: 10x1 Standard Chain Wrap Capacity (teeth): 37 Cage Length: Medium Rear Der/Shifter Compatibility: SRAM Exact Actuation Drivetrain Speeds: 10 Weight: 151