Originally Posted by Rowan

Anyway, my advice would be to get expert in feeling your tyre pressure (most people think their tyres are pumped up enough when they use their fingers to test, but in fact the tyres are at half pressure), or invest in a Zefal tyre pressure gauge, or invest in a Topeak pump with the gauge included.

Oh, and look at the highest pressure spec on the sidewall of the tyre. and if you go to a wider tyre as per the other thread, readjust your bike computer to the appropriate circumference setting.