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Discussion Starter · #1 ·
I've had two sets of tires wear oddly the last few years. It's like a cupping all across the tire on all four tires.

Shortly after putting on the first set of tires (Yokohama) and seeing the odd wear, I had the rear shocks replaced with Volvo parts. It didn't seem to have much affect. The front struts were replaced after getting the second set of tires (Continental Extreme DWS). Still no affect even though the wear looks like what I've seen on cars with bad shocks.

I've had the car at a local Volvo specialist and the nearby dealer, but they cannot suggest what the issue is. I've also had the tires road force balanced. Unfortunately, nothing has helped. The ride is terrible, especially when cold until things warm up, then it's just bad.

As winter is prepping to set in, I am now looking at a third set of tires. Before doing so though, I really want to figure out the odd wear and poor ride.

The wear was really pronounced when the tires were newer. Now that they are getting pretty worn, the issue doesn't show in pictures very well. So I added some exagerrated lines to the photo as illustration.



I can still feel the odd wear pattern when running my hand across the tires.

Can anyone make suggestions as to what's up?

The car is a stock '04 v70 t5 auto with 198K miles.
 

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At what mileage do you rotate the tires..How does the suspension feel ;Same as when you bought it or different now with the mileage?
 

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Discussion Starter · #3 ·
I like to rotate at 15K or so.

I purchased the car used a few years ago with 60K miles or more on it, so I don't know what 'new' feels like. If anything, the suspension feels a slightly stiffer.
 

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You should rotate earlier but this is a toe issue
 

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Discussion Starter · #5 ·
Will toe issues cause the tires on all four corners to wear in a cupping manner? The odd wear pattern started on all four tires before they were rotated the first time. Or are you seeing the outter wear, which is an aliignment issue, and saying that's a toe issue? I agree there, but don't know if it's the cause of the cupping. I forgot to mention I had the car 4 wheel aligned by three different shops (including Volvo) and it made no difference, except the last guy put the toe out -which started heavier wear on the outter section of tire.
 

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I've seen this happen when the bushings in the front suspension have worn out, changes the alighnment geometry and feathers the outter edges or inner ones. inadiquate tire pressure can cause cupping issues too. Make sure your suspension components are all up to snuff and have it propely alighned again.
 

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Discussion Starter · #7 ·
I'll check the bushings at all four corners. I guess this will be another project to add along with refreshing the PCV system and replacing the upper engine mount.
 

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Do you like your corners? A corollary: are your normal routes straight or twisty? I found that I have much worse cupping on the outer edges than others because I like to bank and because I only drive in-town, so its all left-right-left-right etc compared to commuter warriors who spend 90% of their time on a single high-speed road like an interstate.

Oh, and DON'T rotate more infrequently than every 5K. FWD cars by nature are far from the perfect 50/50 weight split and the more frequently you rotate, the better it compensates for the weight distribution. I've seen FWD minivans completely wear out the front tires in 15-20K while the rears look brand new.
 

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Discussion Starter · #9 ·
I love corners, but my driving is on all types of roadways. I feel my outer tire wear is from a poor alignment I received last time. I think the guy did this in an attempt to correct the cupping issue. My current rotate schedule seems to work well (for me) leaving very evenly worn tires by the time they're ready for change.
 
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