sram cassette pg 1231 xplr 12 speedThis 12 speed 11 44T provides 2x range in a 1x package and fits on a traditional 11 speed driver bo Specifications Body SRAM Shimano 11 speed only Brand SRAM Color Silver Group Comp Sram XPLR Item Name PG 1231 XPLR Item Type Cassette Other For use with XPLR 1x rear derailleurs, Compatible with Flattop chains Package '1 1 Ratio 11 12 13 15 17 19 21 24 28 32 38 44 Series Name XPLR Speed 12 speed Sprocket Material Nickel chrome plated steel Technology