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I run 25mm tyres on 17mm internal width rims. Measured width is 26mm or thereabouts.
Officially the Super Acciaio takes 25mm but a friend has used 28mm for a Roubaix trip without any problems.
The clearance is tightest where the chainstays join the BB shell but that may have changed since the 2017 model I have. 28mm measured is a sensible max I reckon.
Edit: just remembered I did have some 19mm rims with 25mm Corsas that measured at 27ish mm. No problems.
callumj
@callumj @Lampman @wwform
Thanks all for the feedback! If i can get my hands on one i'll take the plunge i think. My current bike has a pretty low front end, so i'm looking forward to opening up my lower back a bit.
Clearance wise - is it tight for tires that measure 25mm? ie. blow up to 25mm, or just 25mm on the label? My bike has clearance for 28mm's, but the tires actually balloon up to 30mm. I'd be keen to get some wide rims/wide tyres on there if possible.