Senior Member
Join Date: Feb 2006
Location: Sin City, Nevada
Posts: 2,882
Bikes: Catrike 700, Greenspeed GTO trike, , Linear LWB recumbent, Haluzak Horizon SWB recumbent, Balance 450 MTB, Cannondale SM800 Beast of the East
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I just picked up a used Specialized Hardrock bike to refurbish and have the rear hub apart. There are 18 1/4" balls - 9 on each side.