Maximum range, minimum fuss - This 12-speed 11-44T cassette provides 2x range in a 1x package and fits on a traditional 11-speed driver body for broad integrationSmooth cog progression keeps jumps between cogs tightest when itÂ’s time to go fast, with more meaningful gaps for climbingCompatible with FlatTop chains and 11 speed, Shimano style, splined road driver bodiesIntended for use with XPLR 1x rear derailleurs 11-44t12sp11-12-13-15-17-19-21-24-28-32-38-44Silver00.2418.132.001UPC/EAN/GTIN: 710845886164