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Discussion Starter · #1 ·
Ok, excuse the relatively noob post, but I'm not an expert when it comes to cupping tires. I've always owned RWD cars and kept them properly inflated, so never had excessively uneven wear.<p>I bought our R in December last year. Car had 26,800 miles on it, and it had Michelin Pilot Sport All Seasons on it. I do not know how many miles they had been on the car. I had the tires rotated immediately, as the fronts were showing edge wear. I have been religious about rotating the tires since. The car now has just under 40,000 miles. <p>While I rotated the tires last weekend, I noticed that a funny wear pattern had developed. About 1" in the middle of the tires and 1" along the outer edge are getting close to the wear bars on all 4 tires, but the section in between the middle and the edge has got a couple more mm of depth. <p>???<p>I should mention that when I first got the car, there was 40 psi in all 4 tires. I have lowered it to 36-37, then lowered it to 35 for the last 5,000 miles or so. <p>I have noticed that the tires are noisy on <I>new asphalt</I>. Not old asphalt or concrete, but new asphalt. <p>The car was aligned in the spring. <p>It's not a huge deal, since I'm going to have to get new tires probably by the end of the summer, and the car will have an alignment done then. Is this a front-heavy AWD characteristic? Is it because the previous owner had them mongo inflated (39 psi is recommended for the V as a full load inflation, which our car RARELY is)? <p>Your thoughts are appreciated. Thanks for the help. <IMG NAME="icon" SRC="http://********************/smile/emthup.gif" BORDER="0">
 

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Re: Cupped tires? (needsdecaf)

I think you should keep them in the 39 region, maybe 37 in the rear.
 

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Re: Cupped tires? (Johann)

Middle tread wear only is a result of <U>over inflation</U>, Also the outer edge wear is definately from harder cornering.(especially if that is mainly on the front tires)Rick
 

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Re: Cupped tires? (Mash)

"Cupping" is an alignment (camber <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/rolleyes.gif" BORDER="0"> or toe) issue more than an inflation issue.<br>Overinflation WILL wear out the center tread but usually has nothing to do with uneven outer wear
 

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Discussion Starter · #5 ·
Re: Cupped tires? (Johann)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>Johann</b> »</i></TD></TR><TR><TD CLASS="quote">I think you should keep them in the 39 region, maybe 37 in the rear.</TD></TR></TABLE><p>Why, so I can feel like I'm riding on stone wheels? <p>Johann I know that you always argue with Jim about pressures, but I'm just setting it to the recommended setting listed on the B pillar sticker. <p>What did your old VR recommend? Same as in the US?
 

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Re: Cupped tires? (needsdecaf)

I run 35psi front and back. I have tried every pressure possible (within reason) and I find that psi to be very comfortable (over the bumps) yet stiff enough to take a 35mph on or off ramp at twice that speed. (oops would that be considered a kill story about on/off ramps) anyways, just my 2c's. Rick
 

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Re: Cupped tires? (needsdecaf)

You're getting your own post off topic, PRESSURES have nothing to do with cupping tires, (unless you're running 45 or 20 <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/rolleyes.gif" BORDER="0"> ).<br>32 or 3lbs will NOT cause cupping in and by itself<br>JRL
 

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Discussion Starter · #8 ·
Re: Cupped tires? (JRL)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>JRL</b> »</i></TD></TR><TR><TD CLASS="quote">You're getting your own post off topic, PRESSURES have nothing to do with cupping tires, (unless you're running 45 or 20 <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/rolleyes.gif" BORDER="0"> ).<br>32 or 3lbs will NOT cause cupping in and by itself<br>JRL</TD></TR></TABLE><p>Back on topic, is what I described above cupping, or just a really funky wear pattern? <p>I would think that the wear pattern is from the tires probably being overinflated from when they were installed until I un-inflated them. They probably were on there a while....the car was put into service on 1/1/04 and I bought it on 11/30/05 with 26k miles on it and it was a NE car. They were done at Costco with Nitrogen, so they probably held their fill of high pressure a while. <p>Also, would that wear pattern account for the unusually noise (singing) on the new asphalt surfaces?
 

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Re: Cupped tires? (needsdecaf)

A typical tell tail sign of "cupping" is the noise (as if driving an F150 with mud tires) and the edges of the tire being uneven. Just rub your hand on the outer side tread of any tire and if you feel the pattern is bumpy or uneven, you know they are cupped.
 

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Discussion Starter · #10 ·
Re: Cupped tires? (Mash)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>Mash</b> »</i></TD></TR><TR><TD CLASS="quote">A typical tell tail sign of "cupping" is the noise (as if driving an F150 with mud tires) and the edges of the tire being uneven. Just rub your hand on the outer side wall of any tire and if you feel the pattern is bumpy or uneven, you know they are cupped.</TD></TR></TABLE><p>If you mean uneven along the circumference, than no, don't have that. And also don't have the noise all the time, just on new asphalt. Otherwise they are quiet. <p>Uneven across the tread I have, but it's consistent all the way around the tire.
 

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Re: Cupped tires? (needsdecaf)

I would say that the prior owner (at some point) had way too much air in the tires (for an extended amount of time).
 

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Re: Cupped tires? (needsdecaf)

Looking at your post again that sounds like slightly OVERinflated FRONT tires.<br>They will get a bit noisy anyway towards the end of their usefull life, ALL tires will
 

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Re: Cupped tires? (needsdecaf)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>needsdecaf</b> »</i></TD></TR><TR><TD CLASS="quote"><p>Why, so I can feel like I'm riding on stone wheels? <p>Johann I know that you always argue with Jim about pressures, but I'm just setting it to the recommended setting listed on the B pillar sticker. <p>What did your old VR recommend? Same as in the US? </TD></TR></TABLE><p>I do agree that I need to run higher pressure settings because of the higher speeds I drive regulary.<br>I guess you do not see 3 digits that much and for that matter lower pressures should be OK but there is one thing with the Michelin's which is that they run a rather soft sidewall and they need higher pressure settings to get to their load rating. And the V is a heavy understeering car so it needs stability in the front tires minimum, the rears will follow well even with softer tire pressures.<p>I see that I didn't read your initial post that well, find it weird. Normally when running an overinflated tire the mid section tire wear should be wider than you mention. Because you say only a small area is worn and the outer edge I think underinflation in combination with spirited cornering can be the cause. Some sort of tire deformation.<p>Like Jim already mentioned, cupping is a result of bad alignment, something like toe zero or toe out where it should be toe in or vice versa.<p>If you want comfort use the low pressures. As it appears it has an impact on teh way they wear. If you want spirited, not to high speeds but hard cornering from time to time I still think you should at least sacrifice some comfort at least on the front by upping the pressures.<p><br>
 

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Re: Cupped tires? (needsdecaf)

Sounds like they were run at very high pressure and very low pressure, or cornered hard to exhibit the wear pattern you are describing with the middle and the shoulders worn. At the end of the day, sounds like your tires have anywhere from 20,000-30,000 miles on them and are pretty much at the end of their useful life. <p>I always keep my tires at around 39 psi. Granted, they are different tires, but at that inflation they show very even wear.
 
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