Hybrid Car – More Fun with Less Gas

Optimal Tire Pressure

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Posted by Steve Giannoni on December 23, 2007, 8:17 pm
What is the current thinking on this? (Mine's a 2001)

Posted by Bob H on December 23, 2007, 10:33 pm

Harden 'em up too much and you will damage them.

A few pounds over the recommended pressure is probably best.

Posted by Marc Gerges on December 24, 2007, 7:44 am
I don't really buy this 'maximum pressure' guideline. Tires are part of
the suspension of your car. By filling them up to a point where they
can't compress any more, you're letting lots of harshness through to the
bushings and springs. Less comfort - which you may be ok with - and more
wear on the bushings. And less roadholding and longer braking distances.

Mine came from the dealer with huge overpressure, and I let it off
gradually till it became driveable in my eyes. I think I even save gas
driving it that way, because cornering speeds are higher, so I don't
have to brake as much ;-)


Posted by Bob & Holly Wilson on December 24, 2007, 8:09 pm

The studies I've followed, "Transportation Research Board Special Report
286, Tires and Passenger Vehicle Fuel Economy" indicates the more a tire
is inflated, the lower the hysterisys losses and deformation during
driving. This leads to crisper steering and handling.

Another report is DOT HS 809428 "Preliminary Findings of the Effect of
Tire Inflation Pressure on the Peak and Side Coefficients of Friction."
Although maximum cold pressure was not in their data, it gives a good
indication of what to avoid.

So far, I have had no problems running 51/49 on my Sumatomo T4s and have
gotten very good wear reports from the tire rotations. It looks like
I'll get all of the project miles and perhaps a few more.

Bob Wilson

Posted by Elmo P. Shagnasty on December 24, 2007, 8:16 pm
  bwilson4use@hotmail.com (Bob & Holly Wilson) wrote:

No, it doesn't.

That's ridiculous.

So if I inflate my tires to 100psi, by your take I should have the
handling and steering of an F1 car?

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