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Old 04-30-2009, 05:50 PM   #1
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Tire confusion Negative Camber?

OK so I just put my summer tires on the car last week and while doing so I noticed an unusual amount of wear on the inside of both front tires. It is about an inch deep. I figured this was some excessive negative camber wear from maybe the bushings on the control arm being worn out, and this is still possible as I have not checked yet. A few days later I thought to check the snows though and they show no sign of wear even though I put about 3000 miles on them this winter. What do you guys think? Are the snows not wearing out because they are narrower, have a lower psi, or something else? Also is my assessment right on the negative camber? Is there anything else that could be causing this?
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Old 04-30-2009, 06:13 PM   #2
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Originally Posted by LostAbbott View Post
OK so I just put my summer tires on the car last week and while doing so I noticed an unusual amount of wear on the inside of both front tires. It is about an inch deep. I figured this was some excessive negative camber wear from maybe the bushings on the control arm being worn out, and this is still possible as I have not checked yet. A few days later I thought to check the snows though and they show no sign of wear even though I put about 3000 miles on them this winter. What do you guys think? Are the snows not wearing out because they are narrower, have a lower psi, or something else? Also is my assessment right on the negative camber? Is there anything else that could be causing this?
In my case, for the two GM900s that I have owned, the fronts have -1.5 deg while the rears are between -1.9 deg and -2.0 deg. If you have your alignment report, you'll notice that the rear negative camber is more than the front. Also, just an observation, the neg camber in my car did not change with the stock suspension with OEM bushings, after lowering with poly bushings, and going back to the OEM SE suspension with poly bushings.

Using the rear axle camber shims from GS will help to alleviate that issue. The shims will help mitigate the wear, inner tire cupping.
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