At We Are One, we work with the most reliable hub manufacturers in the industry. You are able to select from hubs made by the fine folks at Industry Nine, DT Swiss, Onyx and Hadley. Freehubs can be a confusing world but rest assured, we've got you covered. We offer a freehub for any drivetrain you are specing you're wheelset around. XD - SRAM Microspline - Shimano - Generally found on newer, more expensive cassettes that are 11 or 12 speed. HG - Shimano - Generally on more budget friendly cassettes and are more commonly found on older drivetrains (7 - 10 speed) To confirm your driver it is best to remove your wheel and look up your cassette by referencing the part number on outer ring of the cassette. If you have any doubts please contact us, we're here to help!