why are my steer tires cupping?

What does tire cupping have to do with poorly balanced tires and mal-engineered shocks? What does myocardial infarctions have to do with consumption of animal products? Try everything, well almost everything. Government schools have..., it is so sad.

 

you bet ,that was my problem went through 2 pair that should have lasted twice as long as they did before i was told about shocks!

 

this my sound really dumb but its still the truth my 95 379 did that for 2 years to make a long story short after about $1200 and 3 diffrent shops and lots of new parts i put it in my shop and went to tearin the thing down and found the left front brake draging fixed it and all my front end probs went away

 

Uhhh, a good tech jacks each wheel up and rolls it to make sure that isn't a problem....and you would not believe how many drivers ask what I'm doing and why. I've even been known to reset the steer brakes to have equal throw on the pushrod so that it won't cause a problem.

 

Wtf?................

 

The most critical aspect of steers is balance. Alignment, shocks, greasing the fifth wheel are all really maintenance issues that, let's assume, are intact. Get a good tire shop that will jack one tire up and use a tire spinner. Spin it up and while he has it spinning go rest your hand on the opposite side's fender. If it's unbalanced, this side will shake the whole truck sometimes violently and you are driving down the road like that. Avoid shops that mount a wheel on a balancer and multiply with software by spinning it slowly. This is horrendously inaccurate. My shop insists I check back every 50,000 km to have the balance checked.

 

Has anybody ever known of centramatic balancing rings going bad? I've had mine for about 7 years now and I noticed on their web page they only have a 5 year warranty on them. I have inconsistent cupping around my right steer inner and left steer outter. I've changed everything except for the centramatics and I only get about 45000 miles out of them. from this forum i learned that part of the problem is these cheap Chinese tires I bought but that's why I started buying them because i was tired of eating up good ones. I took the truck to Josam in orlando, fl which is supposed to be the best alignment place out there and when the problem persisted they told me it was the tires. I just hate the thought of buying good quality tires and having the same problem.

 

Yup I agree ...same problem here, new king pins/ 3 axle alignment solved it
I had cupping on both and a sidewinder pattern on one

 

Centramatics do get clumped up inside. The problem is they are only good for a few ounces of balance weight. If your tire is never properly installed, or out of balance beyond what centramatic can compensate for it is a never ending battle and no matter what the tire will wear. Once the tires are cupped, that's it. The tire is now out of round aswell. Balancing and alignments or what ever else will not put rubber back on the tire. We see alot of tires that are mis-mounted from day one.