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Discussion Starter #1
Hey guys,
Looking at getting the black speedstars from Custom Wheel Shop along with some General GMax AS-03's in 255/40/18 (same diameter as the 255/50/16's on it now and speedo is accurate). I had the Gmax tires on my 1999 Mustang GT and loved them, but on my Mustang they were in the stock size so air pressure was easy.

Anyone running 18x9's care to chime in with what you run for air pressure and how it wears?

Thanks!
 

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for daily driving and street use tires put the tires at 80% of their max pressure rating

so if its 50psi max put it at 40, if its 44 max put it at 35

If you have a drag tire, start at 20psi and adjust accordingly based on contact patch

thats my take from my own experiences
 

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Discussion Starter #4
for daily driving and street use tires put the tires at 80% of their max pressure rating

so if its 50psi max put it at 40, if its 44 max put it at 35

If you have a drag tire, start at 20psi and adjust accordingly based on contact patch

thats my take from my own experiences
How does running at 80% max do on tire wear? I'm not concerned with racing/drag as the car is a street car. I may take corners quickly, but no racing.
 

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You might want to do the chalk test.

Start with a good alignment and a ballpark guess tire pressure. Use chalk to draw a line across the width of the tread. Drive it, and see how the chalk wears. Try different pressures until the chalk wears evenly. That's how your tires will wear.
 

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Discussion Starter #6
You might want to do the chalk test.

Start with a good alignment and a ballpark guess tire pressure. Use chalk to draw a line across the width of the tread. Drive it, and see how the chalk wears. Try different pressures until the chalk wears evenly. That's how your tires will wear.
Thank you! I will try that.
 

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+1 on the chalk and just watch the wear. Pick up a $5 tread depth checker and measure inside, center and outside at every oil change. Keep track of it and adjust as needed to keep them wearing evenly.

BTW this is also a great way to catch problems with your alignment before something out of wack totally kill your tires.
 

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Discussion Starter #8
That's a good idea. I'll pick one up when I get my new wheels/tires.
 
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