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  • Wheel Alignment - Camber
  • Wheel Alignment - Camber
  • Wheel Alignment - Camber
  • Wheel Alignment - Camber

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  1. #16
    Member Huskerman's Avatar
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    Tim...what do you mean by modified your GS's rear rims? I also was unhappy when I could not find AS tires to fit my 10 GS. I ended up with Bridgestone Potenza RFT's with a revamped alignment and I really like them. I am curious what you did to modify your rims.....or did you buy new off the aftermarket? Thanks........

  2. #17
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    Quote Originally Posted by Huskerman View Post
    Tim...what do you mean by modified your GS's rear rims? I also was unhappy when I could not find AS tires to fit my 10 GS. I ended up with Bridgestone Potenza RFT's with a revamped alignment and I really like them. I am curious what you did to modify your rims.....or did you buy new off the aftermarket? Thanks........

    I bought a set of 12" OEM GS rear wheels and had them professionally cut down about an inch and a half off the inner side. This way the offset on the outside is still identical to the OEM GS as manufactured. There is absolutely no difference in looks unless you look for a 12" wide tire from under the car.

  3. #18
    Technical Writer for Internet & Print Media
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    Quote Originally Posted by Tlm2010gsc View Post
    (snip)
    Tadge J told me in an email they had found that the Michelin's were much better all around over the GY and that was why they went to them on the C7.
    You're exaggerating what Juechter may have said.

    It is true that, in the C7 tire contract "shootout", done by GM, Michelin and Goodyear during late-2010-to-early-2011, the Michelin submission tire performed better than did the Goodyear, but it's an exaggeration to say it was "much better." GM subjected Michelin's and Goodyear's submission tires to 16 different tests. Half of them tested performance and the other half tested "non-performance" characteristics such as tread life, ride and noise. GM has been unwilling to disclose the actual scores in the 16 tests, however, in April of '13, when I interviewed Jim Mero, the GM develoment engineer who conducted most of the tests, he said that if Michelin was a 10, Goodyear was an 8. While Michelin was noticeably better, it's an exaggeration to say Michelin was "much better".

    Another issue was that no one made a 12" wide AS run-flat so the rims on the C7 were made a little narrower to make the michelins work without making a whole new tire design just for the C7.
    That statement is inaccurate.
    C7 wheels are the same width as C6 base wheels but are more narrow than C6 GS wheels. The reason C7 base/Z51 wheels are more narrow then C6 GS wheels has nothing to do with available tire widths.

    In fact, the new, Michelin Pilot Supersport ZP in P245/40ZR18s and P285/35ZR19 (base) and P245/35R19s and P285/30R20s (Z51) was engineered specifically for the 2014 Corvettes and, in fact are...."a whole new tire design just for the C7."

    So on the C7 you can get AS - PS2's ZP tires all around.
    You can't buy car that way, but you can buy Michelin, all-season tires, in the C7 sizes on an aftermarket basis. Also, according to Michelin, the recommended all-season tire for C7 is the new Pilot Supersport A/S 3 and not the Pilot Sport 2.

  4. #19
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    Quote Originally Posted by Hib Halverson View Post
    You're exaggerating what Juechter may have said.

    It is true that, in the C7 tire contract "shootout", done by GM, Michelin and Goodyear during late-2010-to-early-2011, the Michelin submission tire performed better than did the Goodyear, but it's an exaggeration to say it was "much better." GM subjected Michelin's and Goodyear's submission tires to 16 different tests. Half of them tested performance and the other half tested "non-performance" characteristics such as tread life, ride and noise. GM has been unwilling to disclose the actual scores in the 16 tests, however, in April of '13, when I interviewed Jim Mero, the GM develoment engineer who conducted most of the tests, he said that if Michelin was a 10, Goodyear was an 8. While Michelin was noticeably better, it's an exaggeration to say Michelin was "much better".

    You weren't part of what was discussed so let's leave what you think someone may have said out of this. Shoot-out ? Now there's an exaggeration. These tire companies like all other suppliers are supplying a product with performance spec at a price. There are far better tires for tracking and all around use but there is a balance to what the spec dictates vs the market they were trying to hit. In the end it doesn't matter much what the engineers may chose if marketing has other marketing motives in mind. Along those same lines it was GY these folks thought were great tires for corvettes on prior models. The GY are may be for performance and but don't have any kind of acceptable life span and are the nosiest tires on the market After 13 new corvettes i can agree with what Tadge told me, the michelin were a far better tire for their choice. I have switch to Michelin every time after the OEM just failed to perform. So much for engineers shoot-out concepts.

    That statement is inaccurate.
    C7 wheels are the same width as C6 base wheels but are more narrow than C6 GS wheels. The reason C7 base/Z51 wheels are more narrow then C6 GS wheels has nothing to do with available tire widths.

    This issue came up when another owner asked me how I handled the rim problem with AS tires on A GS not any other car. The z06, ZR1 and GS all cannot have AS ZP tires on their rear wheels by any manufacturer we explored.

    In fact, the new, Michelin Pilot Supersport ZP in P245/40ZR18s and P285/35ZR19 (base) and P245/35R19s and P285/30R20s (Z51) was engineered specifically for the 2014 Corvettes and, in fact are...."a whole new tire design just for the C7."

    that's a stretch to say the tires are just for the C7. They clearly aren't and are available to any car or rim they will fit. Sure tire tread design and make-up are constantly being re-visited with each manufacturers needs which is how the Manufacturers meet that performance spec that engineering dictates. The PS2 now the PS3 is a good example. Did Jim mention why they went from a wider better gripping 12" to a narrower tire on a faster car? I asked that question and it was once again marketing who decides what gets ultimately chosen. The engineers are only a piece of a puzzle to what gets built. If they had they're way none of us could afford the vette. The high end vettes are not what GM is going after when it comes to the C7 even though the C7 is quite a fast car at any price. I'm a great example of that according to my conversation. The corvette with GY's cannot be driven in colder climates below 45 degrees without major problems with traction and there is NO option for me to buy any any cost to get a AS ZP tire for my car.

    All pre-c7 vettes have summer tire only on them. Talk about limiting the market to only warmer climates for DD's. The C7 is trying to break the poor sales showings of recent years and has to reach out to every segment of the country, hot, warm, cold etc. They had to make changes and the smaller rear rims allowed the AS ZP being available by Michelin as an option for me to use my C7 as a DD and not sit in the garage until a sunny warm day shows up. That's not the only reason but was one mentioned once I got into the whole tire design problem for colder climates.


    You can't buy car that way, but you can buy Michelin, all-season tires, in the C7 sizes on an aftermarket basis. Also, according to Michelin, the recommended all-season tire for C7 is the new Pilot Supersport A/S 3 and not the Pilot Sport 2.
    That is true BUT these are not just AS but also ZP as well and as least now I can buy a C7 and switch to them as an option for colder climate and safer driving of the car. Never had that option before with the GS unless you did what we did to our 2010GS which gets very expensive to say the least. I just that makes me a new buyer who decided that the c7 is my next Corvette. # 14 and counting.
    Last edited by Tlm2010gsc; 09-01-13 at 02:10 PM. Reason: High-light comments

  5. #20
    New Member mikeCsix's Avatar
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    Default Wheel alignment camber

    After reading the comments and from my own experience, negative camber numbers are less of a concern for tire wear than toe. too much toe will wear the tires much faster.

    I'm an hpde enthusiast, ran six events last year and one event the year before. I run in groups 'B' and 'C'. I'm on my original set of GY Supercars and run -.95 camber in front with minimal toe. I have 14k miles on the car. With the rubber bushings in the suspension, camber jumps all over the place and it will likely be different nearly every time you put the car on an alignment rack. My tires are getting to the point where they need replacement (could do maybe one or two more events) and I have more wear on the outside of the tires than on the inside indicating I need a bit more camber - perhaps -1.2 to -1.5. I also have the pfadt camber plates which lock in the adjustments.

    My suggestion is to do the pfadt street performance which is within the FE3 specs with minimal toe (you want a little to aid stability) and you should get good tire mileage.

  6. #21
    New Member MTsVette's Avatar
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    [QUOTE=c4c5specialist;1125016]
    Quote Originally Posted by AlHewitt View Post

    HI there,

    I cannot say if all GS came with the XFA option, I do not know the packaging requirements for these options.

    However, I would say to you that I have tuned many Corvette alignments to 0.0 camber and NEVER had an issue with negative handling affects on the street. And I have gotten 25000 miles out of a set of front tires without issues.

    I do not believe that you will notice any handling difference and I believe you will be pleased with the longevity of your tires.

    Allthebest, Paul
    I have my camber set to 0 degrees. Tires are wearing great and still handles very well.

    MT

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