Originally Posted by
Bikewolf
I have 42 mm tyres, Marathon Winter. Which tyre pressure, perhaps as a starting point, would strike a good balance between traction/grip on ice and puncture resistance? 50 psi?
Look on the tire sidewall for the recommended max and min pressure.
When it's pretty clear out and your only concern is small patch of black ice run them at the max pressure listed on the sidewall (I think it's like 65psi or something).
When it's grittier out run them at the lowest pressure listed on the sidewall (I think it might be 30psi? I'm not sure offhand).