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ak-
25mm, I don't worry about puncture on hill climb when you're out of the saddle putting all the weight on the handlebar, I run the front at 60psi for this reason (weight 70kg).
When the rear was inflated at 60psi, it's a little hard keeping the rear wheel down when out of the saddle to sprint at the start and halfway, plus more grip is hugely welcome (like a dragster actually!).
edscoble
Ouch! can feel you, still you are quicker than last year.
I realised there's one overlooked aspect of hill climb; tyres pressure, what do you run your at?
I got mine at 35psi on the 25mm tyres, seemed to provided just the right amount of grip without slipping/skipping.