SRAM Red 10Speed Aero Glide WiFLi Road Bicycle Rear Derailleur Exact Actuation shifting provides fast, accurate shifts 32T clearance thanks to the mid cage design: widest gear range available New silent shifting with optimized AeroGlide lower pulley, ceramic bearings New spring-fixed barrel adjuster, New chain pulley cage adds precise chain management Titanium pinch bolt keeps a low profile while minimizing weight