Put some chalk on the tires and drive around the block. You'll see pretty well what is going on.
I find that the optimal contact with the tires on my car is a little bit more than the owner's manual says is appropriate with OEM tires, and a good bit less than what the maximum allowed by the tires is.
--scott
LOL! Well, I only got 2.75" touching when I spun them up hard, a bit less than the chalk test gave me. I had to test my new clutch out eh.
Mike
Mike wrote in article ...
Now, your ignorance is showing......the term "ignorance" meaning something you are not aware of, and not meant as a personal insult.
Anybody who works on cars professionally and removes tires on a regular basis will tell you that drive tires wear in the center - mostly due to the belt "pulling" the tread on acceleration and deceleration inputs - and steering tires wear on the edges - even with absolutely correctly aligned wheels. On RWD cars, this results in the rear tires wearing in the center and the fronts wearing equally on both edges - even when properly inflated.
On FWD cars with both steering and drive inputs on the front tires, the rears will often outlast two sets of front tires.
OTOH, if the edges wear on an overinflated tire and the person believes YOUR THEORY that edge wear automatically indicates underinflation, they could overinflate the tire and have it pop on a hot summer's day at 70+ mph on the Interstate.
Anybody who sets tire pressures by the tire's appearance is too stupid to be operating a machine as complex as an automobile.
Oh BS, prove it to your dumb ass self, Get water on your driveway, drive throught it and measure the tread width, go pump up your tires
20 lb and do it again, you will have less tread on the ground with more pressure, what touches is what wears.----------
Check out the various papers devoted to tire over/under inflation at
That's the Society of Automotive Engineers, dumbass!
I suppose your "water test" is a bit more sophisticated that their tests, eh?
ransley wrote in article ...
Oh BS, prove it to your dumb ass self, Get water on your driveway, drive throught it and measure the tread width, go pump up your tires
20 lb and do it again, you will have less tread on the ground with more pressure, what touches is what wears.----------
If the ONLY application for the tire was to be rolling across the wet driveway at
Pressure is pressure no matter the car. The Crown Vic has much larger tires to compensate for the much larger car, but 45 psi is still too hard for safety.
As someone who has worked on cars professionally for the last 25 years I have to wonder were you get your information from. I have never seen a properly inflated tire wear in the center, NEVER, drive tire or not ! Also, when I say properly inflated I don't mean going by the door jamb sticker. The manufacturer may set the recomended pressure a little low for a better ride and this will cause the tires to wear on the edges. Inflate the tire to proper pressure and the edge wear stops.
- and
Not with properly inflated tires unless you like to corner fast.
On RWD cars, this results in the rear tires wearing in the center
Bullshit ! A properly inflated tire WILL NOT wear in the center! I have seen thousands of tires on all kinds of vehicles and the ONLY cause of centere tread wear in OVERINFLATION !
Front tire edge wear is common on some vehicles due to suspension geometry but MOST vehicles will not show egde wear in normal driving unless the are underinflated.
Thar's why you rotate your tire on a regular basis.
Wrong again. If you read the vehicle owners manual or the tire manufacturers websites you will notice that for sustained high speed driving they recommend you INCREASE the tire pressure. LOW tire pressure causes the tire to flex, which causes heat buildup and can soften the tire and cause it to fail. An overinflated tire will wear in the center but WILL NOT blow out.
+
Not sure what you mean by "appearance" ? If you mean looking at the sidewall to visually determine if the tire is properly inflated then I agree. If you mean by looking at tread wear then I don't agree, and neither do the tire manufacturers. Got to any tire manufacturers website and most will have pictures that show uneven wear on tires due to improper inflation.
You do this on your daily driver ?
Ah, I now see were the problem is ! You are talking about race car tire wear and we are talking about street car tire wear. Of coarse hard cornering will heat up the outer edges of a tire. This will happen on a race car AND street driven vehicles. I like to corner hard and always have edge wear on my front tires even if I up the inflation by a few psi.
Mike wrote in article ...
Then that blows your theory about overinflation/center-tread wear. You SHOULD be able to add enough air to compensate for your driving style, and give you even tread wear by making the centre of the tread work harder.
Mike wrote in article ...
But, if YOU are correct regarding overinflation/center tread wear, you SHOULD be able to increase tire pressures to the point that the center wears evenly with the edges.
Apparently, you have not learned a lot in your 25 years of "professional" work.....that, or you simply don't pay much attention to the vehicles you work on.
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