Sram eTap version fits 12 speed Sram Red and Force Etap AXS derailleursAlso compatible with (post Sep. 2020) Red eTap A2 11sp derailleurs with the Hydro Clutch, NOT compatible with the original (pre Sep 2020) 11 speed etap derailleurBesides reduced friction, this cage is built with shifting accuracy, gravel worthiness and chain retention in mindLong tooth profile on lower pulley offers best possible chain retentionLower pulley assembly features a chain catcher to prevent jamsCan be used dependably on or off roadOversized 14 and 19 tooth Kogel pulleysSram eTap Red/ForceRedUPC/EAN/GTIN: 735201957128