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Fit Perfectly - ISO 492:2005 Standard, The aperture tolerance range is controlled between 7um, make sure fit great. Roll Smoothly - Internal G5 steel ball and synthetic grease, minimize friction, improve rotation efficiency. Without Backlash - Under the condition of non-laod, the radial swing play is within the 9um range. Dimensions Correspond - Inner ID 16mm, Outer OD 31mm, With B 10mm, match the rear hubs of the bike. Specialized recommends you replace these about once every 6 months with agressive riding and once a year for passive riding.