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@tmevans
on our tandem i cobbled together an unramped 42/24t chainset on a triple mtb crank with the outer in the place of the middle. to change gears i have a lovely old friction thumbie and a double XT fr mech. i think i chose this because that’s what i had at the time. the rear is 8spd and works perfectly. i’m having issues, perhaps unsurprisingly, w the front shifts, i think there’s an acera triple fr mech in the spares box, i need a middle ring, ideally a whole set of chainrings, unless anyone has any ideas?