27mm
Okay I have measured mine with a digital calipers.
It's 28.5mm wide (in 19mm wide rims), the front is 45-50psi and the rear is 55-60psi (I'm 71kg).
Interesting. I'm 74kg and the 303s are 17.5mm internal, so maybe at 70psi or a bit less they wouldn't be that much wider. Might be worth a punt on a tyre if I find a good deal
@edscoble started
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27mm