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why prius front tire pressure higher than rear? - Page 3

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Posted by B A R R Y on October 17, 2006, 11:36 am

perfb@yahoo.com wrote:

My 2005 4WD Access Cab Tacoma does the same.

Posted by on October 17, 2006, 4:51 pm

It's to keep your high-beams high enough off the ground.

Posted by Bruce L. Bergman on October 18, 2006, 6:26 am


  Because more weight is in the front of the car than the rear, so
with a light load you want the pressure a bit higher at the heavy end
to keep the tire wear even.

  I'll bet it calls for 35 and 35 if you have four or five passengers
and a full load in the trunk for a trip - and if not, that's where I'd
put it.  If the sidewalls allow higher, I'd bump them both up to the
maximum pressure if you are carrying a maximum load.

  Lots of cars do, some far more pronounced than that two-pound split.
Whenever all the weight is at one end, the tire pressures have to be
staggered to match.

  My Chevrolet Corvair (rear engine aft of RWD axle) has a severe rear
weight bias and calls for 14 PSI front, 28 PSI rear.  (With radials, I
ran it at 18/32.)  The early VW Beetle and Porsche 911 series have the
same layout and a similar rear pressure higher stagger.

     --<< Bruce >>--

Posted by mrv@kluge.net on October 18, 2006, 4:53 pm

perfb@yahoo.com wrote:

something to do with weight distribution.

I tried running my Classic Prius with the same pressures front and
rear.  I didn't do that for long - the car felt like it would fishtail
at a panic stop, whereas with a +2 or +3 psi difference in the front it
would stick those same panic stops.  (Beware of those Dunkin Donut
shops in the morning commute!)

My cousin's Chevy Malibu is 29 psi front, 26 psi rear.

Posted by Coyoteboy on October 18, 2006, 5:01 pm

perfb@yahoo.com wrote:

Fairly normal, certainly every car ive owned/driven has had higher
front pressures than rear. Its due to the weight distribution of the
car - the heavier front end requires more air to maintain the same
contact patch and sidewall deflection.

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