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Tire wear info

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Posted by B. Peg on August 14, 2005, 5:50 pm
One of the handiest tools to have is a "Digital Tire Depth Gauge."  They can
be bought for as little as $5 or as much as $0.  I think mine came from
toolrage.com buts it's been a while since I bought mine.

On the Prius with Goodyear Integrity tires, I did some measurements of the
three primary treads as it came from the dealer who set 34 psi in all the
tires.  The mileage I checked these at was at 250 miles, so they are
relatively new tires.

Front Left:
Outer tread depth:  0.273"
Middle tread depth: 0.295"
Inner tread depth:  0.271"

Front Right:
Outer tread depth:  0.274"
Middle tread depth: 0.291"
Inner tread depth:  0.268"

Rear Left:
Outer tread depth:  0.278"
Middle tread depth: 0.297"
Inner tread depth:  0.268"

Rear Right:
Outer tread depth:  0.276"
Middle tread depth: 0.294"
Inner tread depth:  0.276"

In all instances, the middle tread depth was way too deep meaning the tires
are grossly underinflated from what they should be.  Some have reported
wearing out the sidewalls first which also seems to lead to underinflation.
I know some have raised them to as high as 42 psi front and 40 psi back.
Seems I need much more air than what the dealer or sticker shows.
Downside will be a harsher and noisier ride.  :o(

Just a wild test for those interested.......

Carry on.


Posted by dbs__usenet on September 30, 2005, 6:05 pm

[ clipped ]

I find that the handling and ride are both fine at 42/40.  It handles
road grooves better and the ride is not noticably harsher.

Posted by Bill on September 30, 2005, 6:30 pm

I noticed the difference when I raised my tire pressure but only on
washboard gravel or frost-damaged pavement.  I've had to reduce my speed on
these roads to compensate.  It's an individual value judgment, and I choose
to optimize my mileage.

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