Direct mount rear derailleurs, MatchMaker lever mounts, and SRAM"s new XX1 drivetrain are all examples of mountain biking"s current simplification trend. And if you"re going to take advantage of the reduced weight and complexity of SRAM"s new 1x11 drivetrain, you"ll need a wheelset that"s compatible with its cassette. Don"t worry, this isn"t as daunting as it sounds. All that"s needed in order to make DT Swiss"s 180, 190, 240, or 350 hubs compatible with XX1, is to swap out the existing freehub body with a XD Driver. The DT Swiss XD Driver can be changed without tools and is available for standard quick-release, 10x135mm, and 12x142mm axles.