7-speed cassette on 8-speed hub?
01-22-06, 05:03 PM
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7-speed cassette on 8-speed hub?
I've got a 7-speed cassette on a 1997 Acera-X hub, and I want to put it on another wheel built around a 1996 XT 8-speed hub. I thought 7- and 8-speed hubs might have been the same width back then, but they're not -- the 8-speed is 4mm wider. So there's some lateral play if I put the 7-speed cassette on. Is there any way to do this and end up with proper 7-speed shifting?
01-22-06, 05:29 PM
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Yeah. There's a spacer you can buy that fits behind the 7-speed cassette. You should probably also check to be sure that your two hubs have the same over locknut spacing.
01-22-06, 05:36 PM
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What do you mean by "over locknut spacing"? I put the cassette on to see how the spacing looked, and the locknut fit perfectly and screwed in securely, but the rest of the cassette could move laterally a few mm.
01-22-06, 05:47 PM
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Originally Posted by dmw010
What do you mean by "over locknut spacing"? I put the cassette on to see how the spacing looked, and the locknut fit perfectly and screwed in securely, but the rest of the cassette could move laterally a few mm.
It goes between the largest cog and the flange on the inside of the freehub body to stop the lateral play you're describing.
Over-locknut Distance "O.L.D." spacing is explained here: https://www.sheldonbrown.com/frame-spacing.html
https://www.sheldonbrown.com/k7.html explains everything else you wanted to know about cassette interchangability.
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01-22-06, 05:54 PM
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I should have guessed that Sheldon Brown would have the answer for an old-parts-compatibility question! Thanks.
