uneven rear tire wear - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Brakes, Suspension, Wheels and Tires > Tires

Tires Tires

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  #1  
Old 07-11-2011, 12:08 AM
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akvanden akvanden is offline
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uneven rear tire wear

Does this look like it's wearing uneven? I've seen a lot of threads of it happening on the front, but not on the rear...

https://byfiles.storage.live.com/y1p...ear.jpg?psid=1

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  #2  
Old 07-11-2011, 12:35 AM
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More angles please.
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Old 07-11-2011, 12:42 AM
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How long since your tires were rotated? What pressures do you typically run? How often do you check tire pressure?
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Old 07-11-2011, 12:52 AM
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Quote:
Originally Posted by bore_pig View Post
How long since your tires were rotated? What pressures do you typically run? How often do you check tire pressure?
Good questions. It looks like the inside edge of the tread is more worn. Any chance these
were rotated off the front, or dismounted and remounted?

Are both tires looking the same? If not, how's your rear suspension (if the tires have
not been rotated)?

Good Luck!

Chris
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Old 07-11-2011, 12:57 AM
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Quote:
Originally Posted by christo829 View Post
Are both tires looking the same?
Chris
Also a good question!
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Old 07-11-2011, 04:51 AM
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Only way you can get wear like that I know of is by having bad camber. That's very easy to happen on the front, and very difficult on the rear unless you've bent the axle tubes. I managed to bend the axle tubes on my first axle by overloading it, then bashing on rocky trails with too-soft springs.

But if these tires had previously been on the front, bad camber could have done this. More frequent inspections seem called for.



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Old 07-11-2011, 05:07 AM
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I agree with what everyone is saying ,But is it all the way around the tire, or in one spot,because it could be a bad tire too ,shifted belt.if everything else checks out.
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Old 07-11-2011, 06:56 AM
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Unless your rear axle is seriously messed up, that's not going to happen on the rear. Those had to have been rotated from the front. It looks like they've got a little bit of cupping so you're not rotating them enough and you need an alignment. You need to rotate every 5k miles and when you get your alignment checked make sure they adjust caster/camber to the middle of the spec even if it is green.
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Old 07-11-2011, 12:51 PM
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You have a bit too much negative camber in the front and need an alignment. Postive camber leans the tire outward and negative outwards from perfectly strait up and down. Our camber range is from around .1 to -1.1 degrees, with a preferred setting of around -.50 degrees. The more negative over the preferred setting, the faster the inner tire edge wears. (Towards or over the positive limit and you wear the outers). Problem is that as the suspension settles or 'droops' from wear/spring-fatigue, the camber tends to shift light more negative. - One of the reasons that we need an alignment from time to time and should have the components checked for wear at the same time.

Our suspension geometry also means that adding a lift kit pushes the camber positive (to a point) and lowering pushes it negative. (Why adding either kit requires a front end alignment). By the way, taking turns tighter or at faster speeds also tends to wear the tires, but usually on the outer edges and not the inner.
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Old 07-11-2011, 01:27 PM
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I just purchased the vehicle last week, but the previous owner did say that he replaced something in the front because the tires were wearing un-evenly. I'm guessing/hoping it was fixed and this is just what had happened before the fix. I'll have to keep an eye on it over the new few rotations, see if anything like this keeps up. Thanks for replies though, I never thought about this being rotated from the front....
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