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  1. #1
    Senior Member Three Rings Sniper260687's Avatar
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    A dumb yet reasonable question, regarding tires.

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    So i been thinking, day one with the stock tires 255/30-20 the car ride was very stiff and somewhat uncomfortable so i decided to change to 255/35-19 around 6 months in.

    The ride was a bit more comfortable but I've noticed the steering wheel feel felt way softer not as sporty if that makes sense and i missed that ever since. It basically went from dynamic to comfort mode feel.

    Now im not an expert on tires but is this due to the change from 20 to 19 or from 30 to 35?

    I been thinking lately on getting new tires because i want a ''beefy'' look and also get that sporty feeling back, should i get 265/30-19 or just 255/30-19.

    And of course i only drive the TTS during the weekend so i can handle the harsh ride now.

    2017 TTS.

  2. #2
    Veteran Member Four Rings Audibot's Avatar
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    A larger aspect ratio will give your softer tires. 35 is still a pretty small aspect ratio. Were the tires different brands/models? And what kind of load rating difference? Higher load ratings are generally stiffer tires.

  3. #3
    Senior Member Three Rings Sniper260687's Avatar
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    Quote Originally Posted by Audibot View Post
    A larger aspect ratio will give your softer tires. 35 is still a pretty small aspect ratio. Were the tires different brands/models? And what kind of load rating difference? Higher load ratings are generally stiffer tires.

    The original tires are:

    Pirelli P ZERO

    Size: 255/30ZR20
    Load Range: XL
    Serv. Desc: (92Y)

    Current setup:

    Nitto Invo

    Size: 255/35-19
    220-AA-A
    Serv Desc: 96 Y

  4. #4
    Senior Member Three Rings chrisngrod's Avatar
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    These suckers were still pretty stiff because they're RE-71Rs. Obviously sporty as far as traction.

    265/55/19

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  5. #5
    Veteran Member Four Rings Audibot's Avatar
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    A bit strange. Granted 35 aspect ratio will have a slightly softer sidewall than the 30. But the Nittos are also XL load range, so they should be stiff enough for feedback. I feel like something else may be at play (I say this b/c based on a few reviews with Audis, people say the Invos handle very well).

    If you define "beefier" as having more sidewall for a given size, you would want to move to 265/30 over 255/30.

  6. #6
    Active Member Two Rings
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    I think this is one of the areas where Michelin has most folks beat. Not that the Pirelli or the Nitto are a bad tire but every car I have ever put Michelin tires on (and they were mostly sports cars but also some passenger cars and SUV's) has gained improved steering and road feel as a result of the switch. My feeling is it isn't so much the aspect ratio change (because it is so small) that you are feeling but just the difference in tire compound and tread and that you would get most or all of that feeling back with a set of Pilot Sports or 4S or the like.

  7. #7
    Senior Member Three Rings mossback's Avatar
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    Some of what you are feeling might just be the opposite of what you think is happening, if the Nitto is sticky then you might be feeling the limits of the suspension, ie the car leans more. Have you done any other suspension mods? If the NItto is less sticky then you are possibly sliding more, the stock pirellis are not bad, but not great either, is this winter feel or spring summer temp feel? Rubbers are definitely less grippy in the cold.

    I run 18" wheel on mine for track 265/35 18.
    2016 TTS

  8. #8
    Active Member Two Rings s4 cab's Avatar
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    What's the weight difference between the 20" and the 19" wheel/tire combo? If the 19" combo is heavier, that would make the steering feel heavier, possibly interpreted as less sporty.
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  9. #9
    Veteran Member Three Rings Huey52's Avatar
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    Good point. The OEM 20" are forged and therefore actually lighter than the OEM 19" low pressure cast.

    But all other things being equal it comes down to the tire compound. I too swear by Michelin Pilot Sports, as a bit more compliant while still being high performance.

    Quote Originally Posted by s4 cab View Post
    What's the weight difference between the 20" and the 19" wheel/tire combo? If the 19" combo is heavier, that would make the steering feel heavier, possibly interpreted as less sporty.
    2016 TTS Sepang blue/rotor gray Tech B&O
    Prior: 2013 allroad; 2011 A5

  10. #10
    Established Member Two Rings
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    Also keep in mind that new tires will always feel sloppy and loose compared to old tires.

    New tires will have better traction than old tires, but new tires feel sloppy compared to old tires in the handling dept.

    This is because new tires are on full tread and have more tread squirm.

    It takes the average tire between 1,000 to 2,000 miles to fully come in , depending on the tire compound.
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  11. #11
    Senior Member Three Rings Sniper260687's Avatar
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    Thanks for the replies.

    Just like someone said here, could be the wheels as well.

    So should i even consider 265/30-19 ?

    Or would that look stupid on such a small car?

  12. #12
    Established Member Two Rings
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    Over tireing (new word) was a big deal in my old Miata community. Fat tires rolling around on skinny rims was a big no no. 265s on a 9” rim seems fugazi to me, but I have lots to learn about my 3200lb fatty.
    2017 Ibis TT 11/4/2017 || Austins-Michelin Snows 11/17 || MSS KIT 2/18 || StopTech ST40 BBK 3/22 || REMUS valved axle back exhaust w/black tips 5/1 || Black Optic grill 5/31
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  13. #13
    Veteran Member Four Rings Audibot's Avatar
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    Quote Originally Posted by TRZ06 View Post
    Also keep in mind that new tires will always feel sloppy and loose compared to old tires.

    New tires will have better traction than old tires, but new tires feel sloppy compared to old tires in the handling dept.

    This is because new tires are on full tread and have more tread squirm.

    It takes the average tire between 1,000 to 2,000 miles to fully come in , depending on the tire compound.

    This is because new tires still have some of the mold release compound in them and it hasn't been worked out. They firm up usually 500-1000 miles in.

  14. #14
    Veteran Member Three Rings Huey52's Avatar
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    Similarly I wish I had never gone to wider tires on my RX-8. They may have looked beefier but significantly diminished its signature steering response and handling. The design engineers usually know what they’re doing, so ...
    2016 TTS Sepang blue/rotor gray Tech B&O
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  15. #15
    Established Member Two Rings
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    To a point they do but they also have comfort and price point requirements that they need to meet, ergo GTI rims are a super silly 7.5” wide. My 225 snows roll over on my GTI Austin rims like it’s their job. I’ll be shopping for 8.5” snow wheels this summer.
    2017 Ibis TT 11/4/2017 || Austins-Michelin Snows 11/17 || MSS KIT 2/18 || StopTech ST40 BBK 3/22 || REMUS valved axle back exhaust w/black tips 5/1 || Black Optic grill 5/31
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  16. #16
    Veteran Member Three Rings
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    It's sidewall stiffness. Stiffer sidewalls give better steering response and quicker turn in, but a harsher ride. Different tires of the same size have different sidewall construction and varying levels of stiffness. As someone else noted, Michelin PSS have stiffer sidewalls than most. Read some tire rack tests, they talk about this.



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