Originally posted by Angelus897
Hey, is it better to leave the spare in, or take it out? The plus of taking it out is obvious, but if you leave it in, doesn't it improve weight distribution?
Also, does anyone know the best PSI to run on stock 195/60-15 RS-As?
Leaving the spare in does help front to back weight distribution...a little. But it's also more weight to pull around the course. The general rule of thumb is take it out as lighter is better.
As for what tire pressure to run, this will vary depending on track surface, weather, type of tire and driver preference. For a 60 series I'm going to guess between 40 - 45 lbs in the front and 36 - 38 lbs in the back. A trick that some folks use to determine how much a tire is rolling over is to take some chalk and draw a circle on the outside of the tire right where the sidewall meets the tread.
After a run, you can see where the chalk has been rubbed away and get a better idea of what's going on with your tires. If the chalk is really worn away in the front and untouched in the rear, you’re probably pushing (under-steering) in the corners. Add some air to the front and let some out in the back.