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@cycleclinic
XT 7 speed tumbies can be put into friction mode. The 7 speed STI's though cant obviously.
7 speed and 8 speed has to be different. No DA mechs of the time has the same geometry and where interchangeable. The sporcket spacing is slightly different on 7 and 8 speed so the shifters must be slightly different. You can bodge it but shifting will not be perfect but good enough for mist purposes.