The SRAM Apex rear derailleur is both lightweight and very durable.
Weight: 200g (short cage)
Exact Actuation makes 10 speed shifting smooth and quiet
Allows for wider gearing than a standard triple; 3% easier uphill pedaling, 9% faster pedaling!
Compatible with SRAM Exact Actuation shifters
Manufacturer's Part Number:00.7515.070.030