Proper Tire setup.... SIZE AND STANCE

Discussion in 'SRT Hellcat Wheels and Tires' started by Milspec, Feb 15, 2015.

  1. Milspec

    Milspec Silver Member

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    Ok so i have done my research and the Michelin Pilot Super Sport beat everything .




    Monsters of Grip Nine Summer-Performance Tires Tested Comparison Tests - Page 10 - Car and Driver

    These are just some that compare the P zero to the Michelin Pilot Super Sport not to mention the Bugatti Veyron use this tire as well as the Koenigsegg Agera R if the aforementioned wasn't enough!!!

    So my question isn't what tire more what size and staggering if staggering at all is best. the 9.5 inch rims are going to be small and I read anther posting here where the OP said that if the tires pop out you diminish top speed ... I would need a engineer to confirm however I doubt it would make any real world difference.

    So since this car is tuned for a certain stance what stance could you increases to that would most mimic the factory setup? I prefer balance over aggressive.
    Would it be better too do a 35 instead of a 40 in the front and same with rear?
    I read that a 315/35/20 would be better than a 305/35/20 if sticking with factory FRONT tire setup. something to do with an OAL diameter of 27 inch???
    Also what size should be matched to the front if the rears are dropping to a 35 should the fronts also go from a 40 to a 35 ...what are the advantages and disadvantages of both?


    Please no BS only if you have some real knowledge add your 2 cents.
     
  2. ChallengerDad

    ChallengerDad SRT Hellcat Moderator Staff Member Gold Supporting Member

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    What are you after? Best responsiveness and handling, best ride, best wear, or best giddy-up off the line? Each has a different answer.
    And keep in mind when you change tire size, (without a programmer) you alter the speedometer if you don't keep the tire height the same as factory rubber.
     
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  3. ATLHellcat

    ATLHellcat Gold Member

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    I've been looking at various tire options and also thinking of going with the Michelin Pilot Super Sports. After driving 600mi on the Pirelli's, it is the only aspect of the car I'm not happy with. They just break traction with any thing more than a slow roll into the throttle. I'm thinking of going with the 295 35/20 for the rear and keeping factory Pirelli up front. Anyone tried this? Only concern is the 40 up front and 35 in the rear but the slight drop in the rear I guess could bring some weight bias to the rear by a few pounds so maybe it is no big deal? Once I wear out the factory tires, then I'd go with the 295 35/20's all around. I won't put on more than 295's on the factory wheels.
     
  4. ChallengerDad

    ChallengerDad SRT Hellcat Moderator Staff Member Gold Supporting Member

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    The Pirelli P Zero 275/40ZR20s are 28.66 inches tall.
    295 35/R20s would be 28.13 inches tall, which will throw your speedometer out of sync to the "low-side" by 2 MPH at 70 MPH. (It will read 70 MPH at 68.6 MPH - good, if you have a lead foot. :D) You could adjust for this if/when a programmer is available.
    The other side of the coin is the tires will grip better in the corners, having less side-wall flex at speed.
    If you're after better hook-up from the rears, the same or slightly higher aspect ratio will help you get the rubber into the road with more sidewall flex, so a 40 or 45 might be a better choice (if available) for the rears.
    I believe a rear wheel at least 10 inches wide, with an 18 to 20 mm offset would be darned close to ideal to accommodate the wider tires.
     
  5. Milspec

    Milspec Silver Member

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    Thank you for the info guys some good stuff so far....
    I want to go more for handling ChallengerDad as I think the straight line is the strong point of the car i would rather work on its short comings .. I plan on putting a strut bar on but for now Im working from the ground up with some tires.
    I dont think 295 will cut it I mean I have that on my 2013 3.8 gen coupe and I have around 450 hp and there just perfect i find for that hp level. So with cars riding around on 315 and 325 with 200 less HP then the Hellcat I dont feel like the bump in size would be wasted on this car.
    Ok so less hight better corning more hight better straight line grip because of flex? So accepting that theory wouldn't it be best to have 35 on the front for grip (less flex when turning) and 40 on the rear (so it squats, flexes and grips)?
     
  6. ChallengerDad

    ChallengerDad SRT Hellcat Moderator Staff Member Gold Supporting Member

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    You may have clearance issues on the front by going so wide. Remember, the front wheels turn inside the wheel wells - the rears don't.
    I ran 245 35s on my '09 up front, and 275 40s on the rear, and it was a completely different animal. You don't want to go too wide up front because of the negative camber - you'll wear the shoulders down to the cord long before you wear out the tread.
     
  7. DGatzby

    DGatzby Gold Member Hellcat Car Club HCC Charter Member Midwest Regional Pres.

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    Problem is that Michelin does not make a tire for our front that uses a 28.7" overall diameter with a good aspect ratio for us as was said above. Why they don't make a 275/40/20 is beyond me, they seem to make nearly every other size. I agree with the OP the PSS is a great choice but no matter what I do with the rears I want to keep the geometry for the fronts the same as OEM wheel and tire size.
     
  8. ChallengerDad

    ChallengerDad SRT Hellcat Moderator Staff Member Gold Supporting Member

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    Look at Nitto Invos.
     
  9. DGatzby

    DGatzby Gold Member Hellcat Car Club HCC Charter Member Midwest Regional Pres.

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    ^ that IS what I am thinking also.
     
  10. Chris Salter

    Chris Salter Silver Member

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    Question - Every time I see a discussion regarding tires it seems the wigth to be the most important thing but you actually have two dimensions a side to side (width) and a front to back (height). It would seem that if I was road racing the width would be important but if I was drag racing the height would be more important?
    Thoughts?
     
  11. my65cuda

    my65cuda Hellcat Member

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    I ran a nitto invo on my twin turbo vipers, was an excellent tire. Ran 5.80's in the 1/8th mile on them driving the car to the track on pump gas. Had a 1.41 60' time
     
  12. Lord Hellcat

    Lord Hellcat Gold Member Hellcat Car Club Gold Supporting Member HCC UK President HCC Charter Member

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    What is the speed load rating of the Nitto's compared to the Pirelli tyre.
     

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