so went to the garage the other day to check the psi in the tyres as i hadnt done it since the snow and they were all over the place. so i put 30psi into them all,

but got me thinking, what psi do you lot put in and why??

i know some over-inflate for breaking traction and some keep them a little low for more grip, but what you you say is the ideal psi on a low profile slightly stretched tyre