The Sram Force 22 Rear Derailleur provides a faster, precise, and easy shifting in road biking. It features a capacity between 28 and 32 tooth and 11 speeds. The WiFli exclusive technology by Sram offers faster shifting while reducing weight so you can ride with better acceleration and without effort. This bike rear derailleur is made of carbon and aluminum, and steel pulley bearings, which is a perfect combination between lightness and durability. It features Exact Actuation technology that favors precision, speed, and silent operation. It includes a new AeroGlide toothed pulley design that provides cushioning, less noise, and efficient driving.Crisp, clean, correct shifting, always:the most precise gear change in cycling is here with the SRAM Force® Rear Derailleur.The SRAM Force® Rear Derailleur takes advantage of Exact Actuation®, an actuation ratio that delivers precise 3mm shifts in every gear along with the widest range of adjustment available, delivering the best 10 speed performance in the sport.The SRAM Force® Rear Derailleur is crafted with cutting-edge materials, including a unidirectional carbon-fiber outer cage and a magnesium inner link.Features:- Exact Actuation® means precise, even gear changes throughout the shifting range.- Carbon-fiber outer cage and magnesium inner link provide strength and light weight.Specifications:- Speeds:10- Material:Aluminum B-knuckle, Magnesium inner link, Carbon/ aluminum cage- Weight:178gTechnology:EXACT ACTUATION®:When we launched our road technology from scratch we reapplied our MTB proven SRAM 1:1 actuation ratio (shifter cable travel :derailleur movement) for 10 speed rear shifting.EA helps to simplify/stabilize the uneasy act of balancing rear derailleur hanger design, tight cog spacing and exact cable tension.The result:the easiest index shifting system to set up and it stays that way.For 2x10V systems.- Compatible with cassettes 11-42T.