why are the insides of my front tires wearing?
#137895
10/17/08 10:26 AM
10/17/08 10:26 AM
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Joined: Jan 2003
Posts: 3,336
Summit, NJ
whiplash
OP
master
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OP
master
Joined: Jan 2003
Posts: 3,336
Summit, NJ
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Past 2 years I've gone through 2 sets of front tires. The insides are wearing real fast. I've taken it to get aligned and the shop says it all adjust ok, which I have a hard time believing. The front suspension was rebuilt about 40k miles ago with polygraphite bushings everywhere, could something have gone bad?
- 67 coronet 4dr, 383/727/GVOD, blown, EFI, daily driver
- 230/238, 114°LSA cam, 1.6 rollers, 9:1 comp, 8 psi boost
- NEW BEST ET - 12.40@110mph...
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Re: why are the insides of my front tires wearing?
[Re: TC@HP2]
#137904
10/17/08 11:03 PM
10/17/08 11:03 PM
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Joined: Dec 2007
Posts: 7,759
So Cal
HealthServices
Why would you even post that?
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Why would you even post that?
Joined: Dec 2007
Posts: 7,759
So Cal
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Quote:
I disagree with the latter half of the previous post, but that isn't the topic at hand.
your tires are wearing because you have too much negative camber. If the shop can't tell that, then find a new shop.
If it is a camber problem you could easily see 1 degree it on a level road. Since I’ve been aligning cars for over 15 years I can easily see as little ½ degree or less without a gauge.
How long do the tires last?
If you put a car's camber at additional 1 degree neg, drive it 5,000 miles. Take a look at the tires afterward. It would take at least 5k to as much as 10k miles to show.
Now put the toe at 1/2" toe in or worst toe out and try to drive it the same amount of miles. You won't make it to 5,000 before the cord shows.
On most cars wear is when braking, the tires will want to toe out at this time. If you have all the suspension components in check the toe will ideally zero. I suspect with the older cars this would be more. That’s why having suspension components in good condition is a must.
What were the specs? If it was a good shop they would have a print out. Not that you could actually trust the readings as it is easy to make them anything they want. But if you can trust the readings and they were all in the ideal range then the readings are changing when you are driving. Ie braking, going around corners, etc. meaning worn components.
You would not normally see feathering of tire tread on front tires unless it is a severe toe problem since they go around corners, this typically scrubs any feathering off. It is typical of rear tires with a toe in condition. Even then you would not normally see it in a rear wheel drive car.
Last edited by HealthServices; 10/17/08 11:06 PM.
Allen
Here's a novel idea, let's not throw a bunch of parts at the car hoping it will fix the problem and instead spend a little time diagnosing it first.
Life was a little easier when I was just a wrench.
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Re: why are the insides of my front tires wearing?
[Re: HealthServices]
#137905
10/17/08 11:10 PM
10/17/08 11:10 PM
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Joined: Dec 2007
Posts: 7,759
So Cal
HealthServices
Why would you even post that?
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Why would you even post that?
Joined: Dec 2007
Posts: 7,759
So Cal
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So yes it can still be a camber problem if it takes the tires a while to wear.
But a bad toe condition will wear tires out faster than camber.
Allen
Here's a novel idea, let's not throw a bunch of parts at the car hoping it will fix the problem and instead spend a little time diagnosing it first.
Life was a little easier when I was just a wrench.
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If all your parts are good and they are getting "correct" readings then they are using the equipment wrong or reading it wrong or refering to the wrong specs. Level is level, toe-in should be a no-brainer, and degrees plus or minus is degrees plus or minus. 
As 440guy says, they apparently don't know what they are doing.
