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Old Jun 24, 2019 | 07:46 AM
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Hi there,
I just replaced my original Goodyear tires with the Michelin ZP tires. After inspecting the removed Goodyears I noticed the right front tire was extremely worn on the inboard side. The tire had cupping and was worn through to the core in one spot. I have read there is an alignment that can be done that is less aggressive for the tires. Does anyone know if that is true? The car is a bone stock 2006 6 speed. I am going to make an appointment today with my local Chevy dealer for the alignment.

MTF
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Old Jun 24, 2019 | 07:53 AM
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I have read about such an alignment as well. Read some older posts that talked about having that done right after taking delivery of a new C6. The 2 tire dealers I have dealt with for the past 20 years on many different vehicles always recommended doing an alignment when mounting up a new set of tires. Did you not have one done when you installed the new Michelins?
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Old Jun 24, 2019 | 08:06 AM
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The tire shop has an older style alignment machine. They said the Corvette was too low to safely drive onto the ramp. The car has NOT been lowered from stock but after seeing the alignment machine my car would clearly scrape the ramp. So off to Chevrolet for the alignment. I live a couple of miles from the tire shop and have put on a total of 10 miles on the new tires. After seeing the damage to the originals I will not drive the car until it gets an alignment.
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Old Jun 24, 2019 | 08:14 AM
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Normal alignment from the factory usually wore out the inside edges of the tires, since the alignment was set for optimum handling vs optimum tire life.

Do a forum search on Pfadt street alignment; that's what you want. One caution - the way Pfadt specs (shows) toe-in vs toe-out are opposite of most other industry published specs. Just keep in mind that you want toe-in, not toe-out.
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Old Jun 24, 2019 | 09:24 AM
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Originally Posted by C5forGreg
I have read about such an alignment as well. Read some older posts that talked about having that done right after taking delivery of a new C6. The 2 tire dealers I have dealt with for the past 20 years on many different vehicles always recommended doing an alignment when mounting up a new set of tires. Did you not have one done when you installed the new Michelins?

Attached the C6 Pfadt Corvette Alignment specifications here....................
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C6 Pfadt Alignment Specs.pdf (91.7 KB, 124 views)
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Old Jun 24, 2019 | 09:46 AM
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Thanks for the specs rkj427. I will take these to my Chevy dealer tomorrow for the appointment. After speaking to the service department they advised me they were aware of both alignment specs. I wonder how these Pfadt street alignment specs compare to the ones the dealer uses. If I find out I will post them so others can be aware of the difference.

MTF
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Old Jun 24, 2019 | 11:48 AM
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Originally Posted by visionary
Thanks for the specs rkj427. I will take these to my Chevy dealer tomorrow for the appointment. After speaking to the service department they advised me they were aware of both alignment specs. I wonder how these Pfadt street alignment specs compare to the ones the dealer uses. If I find out I will post them so others can be aware of the difference.

MTF
The dealer is going to use GM specs. If done correctly it will look like this. I have never had a problem with tire wear when the GM specs are set dead center. My guy is ocd when it comes to wheel alignments and always makes them perfect. I have been using these specs and this guy for 8 years.



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Old Jun 24, 2019 | 12:09 PM
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If you really want to get max tire wear out of your C6 .......

Front Camber: . .-0.5 degrees
Rear Camber: . . -0.3 degrees

Front and Rear Toe: . . Set both to as close to zero as they can get it

Caster: . . Don't worry about it ... it's non-adjustable
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Old Jun 24, 2019 | 12:58 PM
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Wrong, caster is adjustable.
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Old Jun 24, 2019 | 01:10 PM
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The two alignment shops I have used both said that caster is non-adjustable on the C6.

Maybe you know something they don't
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Old Jun 24, 2019 | 01:44 PM
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Apparently I do. See the shop manual for details.
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Old Jun 24, 2019 | 02:15 PM
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Originally Posted by Turbo6TA
If you really want to get max tire wear out of your C6 .......

Front Camber: . .-0.5 degrees
Rear Camber: . . -0.3 degrees

Front and Rear Toe: . . Set both to as close to zero as they can get it

Caster: . . Don't worry about it ... it's non-adjustable
That's incorrect. It certainly is. You can use different amounts of washers for the front and rear upper mount bolts as well as moving both cams on the lowers to change caster. While this will adjust caster, it will of course also change camber and toe. There isn't a "this bolt does camber and this bolt does caster." It all works together.
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Old Jun 24, 2019 | 02:35 PM
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Originally Posted by wjnjr
Wrong, caster is adjustable.
Originally Posted by wjnjr
Apparently I do. See the shop manual for details.
Originally Posted by Sox-Fan
That's incorrect. It certainly is. You can use different amounts of washers for the front and rear upper mount bolts as well as moving both cams on the lowers to change caster. While this will adjust caster, it will of course also change camber and toe. There isn't a "this bolt does camber and this bolt does caster." It all works together.
I think what Turbo TA is alluding to is that caster is not adjustable in the conventional sense. I just went thru this with my guy and he said it is not adjustable in the normal sense of a everyday wheel alignment.
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Old Jun 24, 2019 | 02:37 PM
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Well .... Get your camber exactly where you want it .... Then try adjusting your caster, and you just screwed up your previously camber settings.

I guess that's why most shops will set the front camber and toe, and then leave the front caster alone.
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Old Jun 24, 2019 | 03:22 PM
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Originally Posted by Turbo6TA
Well .... Get your camber exactly where you want it .... Then try adjusting your caster, and you just screwed up your previously camber settings.
Yes, I indicated that. It just means you can't do one at a time separately, but by no means does it indicate that caster is not adjustable.

And for you to offer the answer to someone that is is not adjustable is both wrong and poor advice.

Last edited by Sox-Fan; Jun 24, 2019 at 03:22 PM.
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Old Jun 24, 2019 | 08:35 PM
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'06 with original tires? You were definitely ready for new shoes.
I had the same issue with my '08 at about 20k miles (now at 82k miles). Front tire inner edge is hard to see on a c6, and one tends to think that the inner edge would be the same as the outer. Not necessarily so.
So, whether the factory setting was not the best, or, the car just settled a bit and changed, after my initial alignment at about 20k miles, nothing has changed. The tires are wearing evenly.

How many miles on the car?

Last edited by Sayfoo; Jun 24, 2019 at 08:40 PM.
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Old Jun 24, 2019 | 09:21 PM
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The car has 23,500 miles.
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Old Jun 27, 2019 | 01:34 PM
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Originally Posted by visionary
The car has 23,500 miles.
OK, with that mileage, I would assume that nothing is worn out or damaged. Cupping can some times be associated with worn shocks. A decent shop should give it a once over while doing the work.
Any decent alignment shop should be able to take care of you. Take a good look at the tires periodically to check for feathered edges, etc. and correct if necessary.
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