What does it say on the side of the tyre?
guys, can someone advise on the pressure for this size tyre on a road bike, my weight is 15st 9lbs, if this has anything to do with it...
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90psi (6 bar), and see what the ride is like. Possibly you may need to go a little higher because of the weight.
I know it is a bit late, but you may have a more comfortable ride on 25 width tyres. Plus they actually roll better than 23, despite what seems obvious.