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How wide do open pave come up on regular and wide rims?
Add a couple of mm if you have wide rims, IDK with narrow rims.
I'd be inclined to stick with 25mm regardless of which rims you have: they use the same width tread for both tyres, so there is more sidewall exposed with the 27mm.
Scilly.Suffolk-
With Open Pave, it's actually fine with 27mm as the contact point is much wider in comparison, it's the other that's what you need to worry about (like the Corsa).
@Cupcakes, you can always get the 38mm Compass tyres, as the comfort and speed are much greater and made the Palesa felt like a Marathon Plus in comparison.
However, it's one of those tyres that you do need to keep an eyes out every once in a while, and ensure the pressure isn't too high (high = risk of puncture), for me the trade off is worth it (38mm Compass, and 42mm Grand Bois).
I advise going for 28mm, as this will oddly feel like a 23mm in comparison to what you're used to, minimum 32mm.
edscoble
How wide do open pave come up on regular and wide rims? True 25 and 27, or something else?
I'm debating which size to use on my road bike, and whether I should just use the 27s for commuting too (instead of 28mm paselas, which are more like 26.5 on my rims).