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roboto
Well I just measuered a fresh 25mm vittoria rally on a narrow rimmed ambrosio disc and it came out between 25.1 and 25.5mm from edge of rim to top of tyre at 130 PSI.
VS a 23c hardshell on a 23mm rim at 22.76 most of the way round at 75PSI.
Maybe this will give you some idea?