[Morris]

When I use to do Goodyear test on SS cars with Radials and Bias Ply tires....20#-25# is to low for street driven tires.... when we ran SSA and SSGT for any length of time we would set tires at about 40# and go from there.... by chalking the corner of the tire from the tread to the sidewall and then see how much chalk would come off in the particular test we were doing would tell the most info....... most tire pressures are at around 40#-45#psi. to prevent the tire from rolling off of the rim...

So for Daily driving you can back the pressure down 10%-20% for a average ride ... but the minute you start getting on the car.... then it needs to come up quickly and you can't do it with any driving on the street.

So if you use 25# expect the tire to roll off the rim in aggressive driving....