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20" Wheels What tire pressure?

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Old 06-24-2007, 04:10 PM   #1
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20" Wheels What tire pressure?

Hello all- Just got 20" wheels on my 07 PreRunner and they have about 55psi of pressure in the tires. What should I run in them? I know they can handle the higher pressure but should I actually run that much? Thanks in advance.
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Old 06-24-2007, 05:05 PM   #2
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The higher pressure will help you with your MPG, but it will make the ride a bit rough (especially on 20's).
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Old 06-24-2007, 05:44 PM   #4
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How much do you think the pressure will help the MPG? The size is 20x9 and the original was 16x7. The tire size difference is really not huge. How much do you think I am giving up? 285/50/20 from 245/70/16...
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Old 06-25-2007, 04:29 AM   #5
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Quote:
Originally Posted by kaisersteiner View Post
How much do you think the pressure will help the MPG? The size is 20x9 and the original was 16x7. The tire size difference is really not huge. How much do you think I am giving up? 285/50/20 from 245/70/16...
The sidewall design of your tire will determine how rough your ride is if you are under pressure (see sidewall for recommended and max PSI). At the recommended pressure your tire should be the optimal balance between comfort and economy for its design. At the max PSI you may gain 1-2 MPG, but BEWARE this will cause uneven wear on your tires. The center line will "ball" or flatten. Under inflation will do the exact oposite and wear the outside of the tread.

Moving from a 245(width)/70(% of width as height)/16(rim size) to a 285/50/20 means that you will loose some economy, but you will gain in dry traction and looks.


I hope this helps.
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