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why prius front tire pressure higher than rear?

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Posted by perfb@yahoo.com on October 14, 2006, 4:10 pm

prius tire pressure spec says 35 psi front, 33 psi rear

just wondering what the technical reason for this is?

do other cars do this too?

Posted by Ray O on October 14, 2006, 7:05 pm

My guess is that since the Prius is front wheel drive, the higher pressure
will help improve fuel economy.  Lower pressure in the rear reduces some of
the ride harshness.

It is more common to see higher tire pressure specified for the rear tires,
especially for rear wheel drive vehicles, because that is where the cargo is
usually carried.

Ray O
(correct punctuation to reply)

Posted by Dick Byrd on October 14, 2006, 8:05 pm

The front axle of a front-wheel drive car carries 55%-65% of the total car
weight, requiring more air pressure in the front tires.
   Additionally, the front axle is carrying 80%-90% of the total car weight
under heavy braking, when the "weight-shift" causes the car to nosedive from
the deceleration.


Posted by Ron Sleeter on October 14, 2006, 8:37 pm

Put in 42 front, 40 rear for maximum mpg.

Posted by A Sherman on October 14, 2006, 8:48 pm

I did this to try to compensate for the tread wearing more at the edges
than at the center.  I can't say that I've seen any difference in mpg.

2005 with 20K miles

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