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Re: What tire pressure to run with 235/40/18s??? (archive)

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Posted by TireGuy on February 03, 2001 at 15:02:55:

In Reply to: What tire pressure to run with 235/40/18s??? posted by Brett on February 03, 2001 at 13:18:49:

For average day-to-day street work set pressures to the tire's rated *maximum* (NEVER lower); this is typically 44-50psi on high quality tires (it's amazing how many people don't even bother to look). Performance pressures are *always* higher; e.g., if the tire takes a 44psi normally, then for track run it at 50-55psi.

Lower pressures make tires run hot and lead to premature failure. Higher pressures may slightly reduce the 'grip' area but greatly reduce sidewall flex and thus lead to better cornering characteristics.



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