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edscoble
hard.hat
A bit late - but when I went from a 15mm internal width rim to a 19mm my 25mm labelled Veloflex Corsas went from a measured 23.5mm to 25.4mm. For me that would mean a pressure drop of about 15PSI so pretty significant, though granted it's a big step up in rim width. If you want wider tires then the best thing to do is obviously to buy wider tires.