Sram x0 2x10sp high clamp front mechwide range 2x10 and 3x10 systems with x glide front shifting technologyfeatures42t this front derailleur will work with standard 39 26t and 42 28t ratio chainsets to adjust for 39t or 42t outer chainrings the user simply needs to move the derailleur up or down on the seat tube38t this front derailleur will work with smaller 36 22t and 38 24t ratio chainsets used most commonly on trail freeride or 29er bikes to adjust for 36t or 38t outer chainrings t