Sealed cartridge bearing High flange design 100mm front spacing 36 holes These track hubs by Origin8 are attractive, durable, and reasonably priced. The front hubs are 100mm spacing and the rear hubs have standard 120 mm spacing, with the option of fixed/fixed or fixed/free threading. Other features include high flanges with cut-outs and sealed cartridge bearings. These hubs have 36 hole drillings.