Switching drivetrain brands? To convert a NOBL or Onyx rear hub between HG or XD drivetrains, you'll need a conversion kit. Each kit comes with the freehub specific sized axle, the freehub body and the corresponding end cap. The alloy freehubs are considerably lighter than the steel versions (45g for XD, 71g for HG) and are recommended for riders under 200lbs. Heavier riders may opt for the steel version for extra durability.
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