Originally Posted by
fietsbob
width of cassette body minus thickness of 7 speed cassette.. but wait.. the way the 7 speed era
cassettes were held on, is, by screwing on the small cog outside, thread on the freehub..
...only if you're talking about Uniglide hubs. There's plenty of 7-speed Hyperglide (with lockrings) stuff out there.