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Old 05-28-21, 08:52 AM
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Location: Mission Viejo
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Bikes: 1986 Cannondale SR400 (Flat bar commuter), 1988 Cannondale Criterium XTR, 1992 Serotta T-Max, 1995 Trek 970

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I’ve been running 7 speed cassettes with 8 speed shifters on my mtb’s for years. I’m using 90’s trigger shifters and I felt 8 speed shifters were better than the original 7 speed.

You don’t get an extra click once you set the limit screws, although one exists.

Since most 7 speed cassettes can be broken apart, I open them up and sand the spacers from 3.15mm to 3.0mm. I do have the luxury of extra plastic and aluminum spacers in various thicknesses so I can fine tune the chainline if I want. You also get a slightly narrower cassette, which is a plus for positions 1 and 7.

I prefer 9 speed RD’s, but 6-9 SIS mtb and 6-10 SIS road, except (DA 74XX without a work around), will work

Obviously, good enough was never good enough for me.


Edit added: If it is a freewheel and not a cassette. Good enough might be your only answer.

If the cogs can be removed, (not typical on modern freewheels), you can fudge the first 4 cog spacing, but positions 5-7 are limited by the freewheel body shoulder. Then again, I haven’t been so inclined to screw up a good vintage freewheel for the sake of less expensive shifters.

Last edited by 70sSanO; 05-28-21 at 09:17 AM.
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