SRAM Eagle 90 Ebike Groupset – 170mm Brose 36T Clip-on Guard Chain XS-1275 10-52t Single Click Shifter Rear Derailleur. Featuring the same Full Mount derailleur architecture as its AXS Transmission siblings Eagle 90 is unquestionably robust. And for the just in case the derailleur body features replaceable outer and inner parallelogram links skid plates and a tool-free threaded cage assembly making it the most rebuildable derailleur weve ever built. At the heart of the system is a sleek and sturdy forged aluminum E-MTB crankset with a drive-unit specific T-Type chainring. Shifting under load is a signature of Eagle Transmission and this is made possible on 90 with an XS-1275 T-Type cassette that features full X-Sync technology and a premium double-click T-Type Actuation mechanical shifter.