How do i tell what cassette my wheel will accept? i have a set of wheels for sale on ebay and i bought them without ever questioning the type of hub. :?
If it's Shimano, seven eight nine and ten speed hubs use the same spline pattern, but the depth of the freehub body varies to accept more sprockets. 7-speed measures about 30.5mm from the shoulder on the freehub body. Eight and nine are both about 34.5mm. I don't own any ten-speed hubs, but I believe the body's actually shorter than 8 and 9 by about 1mm.
There's a page giving details of the various 7, 8, 9 and 10 speed Campag bodies here: