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Very little wiggle room there, assuming a 110mm PCD chainring you can't go below 34T, and Campag don't really do big sprockets, in 9-speed you're probably looking at the 13-28 Veloce.
Some major component changes are in order, if you want to keep the 9-speed Ergos then a long cage rear mech and a triple chainset plus matching front derailleur. Doesn't seem worth it when that still only drops you to a 30/28 gear, still less than 20% below the 34/26 you've already got.
gbj_tester
@Spxtz
Sorry if this or something like it has been answered elsewhere, I UTFS'd and didn't find nowt.
My girlfriend is after a granny gear on her road bike, which has a fine range of gears for normal riding, but last time we went touring, the hills were a bit tricky for her fully loaded.
She's got a 9spd Mirage rear derailleur, with the biggest sprocket on the cassette 26t. Front inner ring is 34t or 35t. What's the biggest rear sprocket she could fit without having to change the derailleur too? Or could she get a smaller front ring, like a 32t, to also affect the ratio?