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The Pro 4 Rear hubs use a new 44 tooth ratchet mechanism. The flange diameter is increased, adding important stiffness to wheel builds. The machined hub shells are. The 17mm axle runs on five cartridge bearings. Pro 4 hubs are 6 bolt disc compatible and available with 28,32 or 36 holes. Rear hubs with Shimano compatible freehubs features a larger bearing, will be supplied ready to take 11sp cassettes.