Old 05-24-20, 09:40 PM
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If the cage angle is correct (outer plate parallel to the chain rings) and the cage height is correct (1-2mm above the tallest teeth on the big ring), the reason for overshifting the big ring is nearly always because the cage is pushing the chain too far. To remedy that, tighten release a smidge of tension on the cable and tighten the high limit screw a smidge. Ideally, when the chain is on small in back, big in front, it should clear the outer plat of the front derailleur by about a millimeter. The unit should "kiss" the limit screw just as maximum cable tension is reached. Too loose and you overshift. Too tight and there's too much cable tension to allow trim and downshifts, and eventually you'll break the shifter.
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