Cupped Tire Fix with a belt SANDER!
 

I did not want to buy another set of tires. Some of the conti extreme contacts have cupped. So I took a belt sander to them. :D
Check the pictures in my locker.

yikes!!!!!

I'm speechless.

All I can say is:
Go buy new tires.

Scary
 

Scary.....very scary. So were they over or underinflated?

Steve


P.S. Guys I was wondering....My car was leaking a little oil, but I fixed it. I put in straight 40 weight oil for a lawnmower...is this ok?

THis is a joke, right?

A joke
 

Do I look like I'm kidding? ;)

Steve

No. It is not a joke.

Yes I would like to buy new tires but I need the money for other repairs and I am pretty sure the new set will cup also sincel I didn't find the problem.

The air pressure does not appear to be the problem.

SAE 40 is non-detergent. It's better than no oil. I have had good results with Lucas oil additive. It takes a few oil changes to work its' way into the seals and parts.

That's it "yikes!!!!"
No comments about making flat spots?
Nothing about making the tire mis-shaped?
How about uneven sanding and wearing down the inside to the remove the cupping more than the outside that had less cupping?

I drove it today to work. :D
It was pretty good.
Nice and quiet again at 80mph,:D
Pulls every so slightly to the right :rolleyes:
And a very slight unbalance somewhere.

What does tire cupping exactly mean?

The tire cupping that I get is always on the inside 1/4 of the tire surface. The middle surface and outside surface of the tread has nothing.

It is a wear pattern that results in the outside diameter of the tire not being round.
The difference from the high spots to the low spots could be about 1/32 of an inch or less.
The distance from the one high spot to the next was about 2.5 inches on my tires.
There were about 28 high spots and low spots around my tires.

The net effect is similar to waves on the ocean when the tire runs down the road.
As the tire rotates each one of those little high spots hit the road and makes noise.
As the troughs get deeper the noise gets louder.

I also noticed when braking that the noise from the front tires gets louder as the troughs get deeper. This is most noticeable at low speeds right before the car stops.

The cupping can be seen if you know what to look for. It can also be felt with your fingers sliding over the surface of the tire.

I once used sawdust in a transmission to help with it slipping :rolleyes: Dont worry it wasnt a SVX :)

Have you ever replaced your struts? If they are not bad, it sounds like an alignment issue. Generally tire pressure will wear tires in one of three ways.

1) even.
2) on the outer edges (underinflation)
3) Inside (overinflation)

Tire pressure should not cause the tires to wear unevenly, just improperly. This is the case as long as pressures are even from side to side.

You've got to be joking me.