I know ritchey say this but there's bugger all room under the fork crown I'd be surprised if you can fit more than 25s.
wont be going bigger than 25... but tyres do seem to come out a bit bigger on Belgium+, hence the questions. Veloflex masters always measure up on the smaller side though, so hoping I will get away with it.
Wide rims usually make the tyre less tall so I'm sure you'll be right. Veloflex 25s on open pros fit OK anyway.
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I know ritchey say this but there's bugger all room under the fork crown I'd be surprised if you can fit more than 25s.