Features:Your needs aren't less demanding, they're different.The SRAM Rival 1 rear derailleur is designed for smooth, reliable shifting,Delivers 100% of what you demandBy eliminating unwanted chain movement, X-HORIZON® moves faster, reducing shifting effort and chain slap.X-HORIZON® design reduces shifting force while eliminating ghost shifting and chain slapLarge top pulley offset automatically adjusts chain gapSealed cartridge bearings and aluminum cageTechnologies:X-HORIZON®,EXACT ACTUATION®, ANDX-SYNC®, ANDROLLER BEARING CLUTCH®, X-SYNCCage LockMedium cage: 11-26 to 11-36T cassettesSpecifications:Speeds: 11 speedsOuter cage: aluminumCompatibility: 10 or 11 speed 1x road systemsInner cage: aluminumBearings: sealed cartridgeCage size: medium 11-26 to 11-36TPulleys: 12 tooth X-SYNC ®.Pull: Exact Actuation® - Flagship technology(ies): X-HORIZON®, CAGE LOCK®.Weight : about 269 gr.Medium cage®.For 2x1 0V systems.Compatible with 11-42T cassettes....