The Rival mid-cage rear derailleur allows the use of a wide range of cassettes up to 11-32. The Rival rear derailleur features SRAM's Exact Actuation for precise even gear changes throughout the shifting range. Exact Actuation delivers and even 3mm adjustment from gear to gear. SRAM's road derailleurs descended form their legendary MTB rear derailleurs so they can take a lot of hard use. The Rival rear derailleur only weighs 191 grams, but it has an all-aluminum B-knuckle inner link and tough alloy cage that will stand up to any serious rider demands.