Sram Red Rear Derailleur

This is a light weight, precision,10 speed rear derailleur that offers fluid performance and is compatible with a 28 tooth Max cassette.
It has an Aluminum B-Knuckle, Carbon-Fiber inner link and cage, Titanium parrallelogram spring, Ceramic cartridge bearing and BlackBox™ Ceramic bearing pulleys.
This combined with the Exact Actuation™ combines to give world-beating performance and weight savings.