Revised graphics to match SRAM RED eTap components Hollow steel dome makes for the stiffest gear cluster ever at the lightest weight Compatible with SRAM RED eTap, RED, Force, Apex 11-30, and 11-32 ratios are NOT compatible with SRAM RED eTap short cage rear derailleur - Must use WiFli mid-cage rear derailleur. Heat-treated, high-grade tool steel provide superlative durability and a beautiful finish StealthRing elastomers and advanced tooth profiles eliminate vibration and noise for a smooth, silent ride 11-30t 11sp 11,12,13,14,15,17,19,21,24,27,30 Silver