The new M4 narrow-wide profile delivers enhanced chain retention and cross-compatibility with Shimano, Sram, and TRP 11/12s drivetrains, including SRAMT-Type. Available in 32T and 34T sizes, it also supports dropping a chainring size to take full advantage of e*thirteens proprietary 9T smallest cog, wide range cassettes.Specifications:CHAINLINE - 55mmCOLOR - Black, Silver COMPATIBILITY - Shimano EP8 motorT-Type Chain CompatibleFEATURES - Lightweight, stiff, long wearlife, with technical aesthetics and enhanced chain retention. Cross compatibility with Shimano, Sram, and TRP 11/12s drivetrains.MATERIAL - Forged-CNC 7075 ALMOUNT - Fits cranks on Shimano EP8 motorPairs perfectly with e*thirteen Helix Race e*spec Alloy CranksSIZE - 32T, 34TWEIGHT - 32T: 115g34T:120g