• Grand Sport Gen 2 tire chatter
  • Grand Sport Gen 2 tire chatter
  • Grand Sport Gen 2 tire chatter
  • Grand Sport Gen 2 tire chatter

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  1. #1
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    Default Grand Sport Gen 2 tire chatter

    My new 2011GS has the new generation 2 tires because it has selective ride control. When turning at slow speeds there is alot of tire chatter/slipping of the fronts. I understand that this is normal because of the tire width but am wondering if I made a poor choice and if the Gen 1 tires would have been better? I have been told that they are superior track tires but they have less tread depth and will not last as long as G1's. Opinions please.

  2. #2
    Member SGF's Avatar
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    Question Interested

    Would be interested in replies too, since just ordered new 2011 GS Conv today.

  3. #3
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    Default Grand Sport Gen 2 tire chatter

    I have a 2010 GS with the gen I tires and they are bad also, the colder it is the worse it is.

  4. #4
    Grand Sport Gen 2 tire chatter Tuna's Avatar
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    Seems pretty normal for really wide front tires with a lot of grip. Even my CTS V does this.
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  5. #5
    Grand Sport Gen 2 tire chatter BigJimZ16's Avatar
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    My '10 Grand Sport Vert does the same thing. I'm almost immune to it now...
    The only thing that you accomplish when you make something idiotproof, is breed a better grade of idiot,

  6. #6
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    Default 2011 Grand Sport tires

    Guys not sure about tire nomenclature, but my 2011 grand sport convertible has not exhibited anything mentioned. The car came
    with Goodyear Eagle F1 tires. I monitor my g forces on the HUD when cornering and I have pushed it near 9 in some corners

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    Anything is better than Gen 1s.

  8. #8
    Grand Sport Gen 2 tire chatter Tuna's Avatar
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    Quote Originally Posted by catbert View Post
    Anything is better than Gen 1s.
    The SuperCar G2's should be better in the rain and pretty much the same when dry.
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    Quote Originally Posted by Tuna View Post
    The SuperCar G2's should be better in the rain and pretty much the same when dry.
    The tread looks wet friendly, but it's a Summer rated tire, so stay out of the cold and slush.

  10. #10
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    Quote Originally Posted by Pourboire View Post
    Guys not sure about tire nomenclature, but my 2011 grand sport convertible has not exhibited anything mentioned. The car came
    with Goodyear Eagle F1 tires. I monitor my g forces on the HUD when cornering and I have pushed it near 9 in some corners
    "...near 9..."


    If you were cornering at lateral acceleration of 9g, you'd also be dead because of your snapped spine.

    I suspect, you meant "...near 0.9g."

    But...I digress.

    The OP was talking about tight turns at slow speeds not high-speed turns near the car's handling limit.

    Wide, ultra-performance radials when turning sharp at slow speeds may "chatter" a bit. The severity depends on the surface, but some chatter is to be expected.

    Also, if we're going to discuss...or complain, as the case might be...about Goodyear EMT tires, let's at least get our nomenclature straight.

    The first generation run flat, the Eagle F1 GS-C EMT, was offered from 94-96.
    The second generation RFT, the Eagle F1 GS EMT, was offered from 97-04.
    The third generation Eagle F1 GS-2 EMT and the Eagle F1 Supercar EMT were introduced in 2005 and continue today.

  11. #11
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    Correct meant .9 G's, spent to many years flying jets and haven't gotten use to using decimal. I believe my driving experience in Arizona is completely different then most of the other states with hits moderate and hot climate.

  12. #12
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    I'm glad I found this thread because I took delivery of my CRM GS vert last weekend and as I pulled out of the dealer I thought the front tires were not bolted on. I have never had a feeling like this in a car. Glad to see it is normal.

    Do the Michelin Pilots exhibit this?
    Has anyone had good or bad experience with the Michelin tires? I love them on my sedans (usually Energy MVX series).

  13. #13
    Grand Sport Gen 2 tire chatter Tuna's Avatar
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    Quote Originally Posted by Kevs CRM Vert View Post
    I'm glad I found this thread because I took delivery of my CRM GS vert last weekend and as I pulled out of the dealer I thought the front tires were not bolted on. I have never had a feeling like this in a car. Glad to see it is normal.

    Do the Michelin Pilots exhibit this?
    Has anyone had good or bad experience with the Michelin tires? I love them on my sedans (usually Energy MVX series).
    Michelin Pilot Sports and Goodyear tires do this.
    Both my Vette and my CTS V have Pilot Sport tires. When it's cold out and I'm backing slowly with the steering near lock, the front tires "chatter" as they grab and break loose.

    First time I noticed this was on my 2004 CTS V with the GY F1 SuperCar tires. Got my attention.
    After changing to GY F1 D3 tires, I didn't notice it as much on the V1.
    My CTS V2 came with Michelin PS2s and they do the same thing when it's cold out.
    My 427 Vert does the same thing and it has Michelin PS2.
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  14. #14
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    Pilot Sports do it. The F1 Supercars on my C5Z do it sometimes.

    In fact, any wide tire, with a soft tread compound and a tread design which has limited or no grooves with very large, stiff tread blocks will chatter at slow speed in sharp turns.

    It chatters because in a turn like that the actual distance traveled by the inside and the outside of the tread is different. Something has to give in that situation so part of the tread suddenly breaks loose and sort of "jumps ahead or behind" and that's the chatter you feel and hear.

  15. #15
    Grand Sport Gen 2 tire chatter BigJimZ16's Avatar
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    Quote Originally Posted by Hib Halverson View Post
    Pilot Sports do it. The F1 Supercars on my C5Z do it sometimes.

    In fact, any wide tire, with a soft tread compound and a tread design which has limited or no grooves with very large, stiff tread blocks will chatter at slow speed in sharp turns.

    It chatters because in a turn like that the actual distance traveled by the inside and the outside of the tread is different. Something has to give in that situation so part of the tread suddenly breaks loose and sort of "jumps ahead or behind" and that's the chatter you feel and hear.
    Nice explanation Hib!!
    The only thing that you accomplish when you make something idiotproof, is breed a better grade of idiot,

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