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Scilly.Suffolk
@Bezzin
I've got myself a set of 38mm crabons with a 17.5mm internal rim diameter. Got some 25 mm GP4000s on there atm and they are coming up at about 27mm. They are a little worn and I'm looking to replace - should I go 23 (is there an aero gain?) or 25mm (assume more comfortable)?
I assume it doesn't matter as I won't notice any aero difference.