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@tmevans
I have a mtb triple on our tandem a 9 spd fr mech, a 9 spd rear mech and an 8 spd shifter on 8sp cassette, the only thing is front shifting is an arse.
I can change this now because I recently found a 9spd shifter, bought a nicer front mech and found both a wider range 9 cassette and a normal 9spd 11-32 cassette. The conventional approach would be 3x9 on the normal cassette but I am tempted by the idea of 2x9 and running something like 26 or even 28 inner and 38 or 40 middle with the wide cassette. This way, the chainrings could come inboard a bit (by not having an outer which the old mech couldn’t fully reach) and there’d be one less of them. of course it might not like the jump, and cause chain length issues. what do you think?