[masraum]

Originally Posted by peteremsley

Hypothetically speaking, if you're traveling from NY to CA, would you lower the pressures on the left side to compensate for the sun?

silly I know, but a few laps on a track can change pressure by quite a few lbs... is the actual number that is critical?

I think the sun makes very, very little difference. Most of the heat in the tires comes from the deformation of the tire as it rolls down the road. Assuming you're going in a straight line on a good road with a relatively symmetric load side to side on the tires, they'll gain pressure pretty equally.