Wheel Size Help and Suggestions

Discussion in 'Wheels & Tires' started by ChaoticFury09, Mar 24, 2020.

  1. ChaoticFury09

    ChaoticFury09 Well-Known Member

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    Hey Everyone,

    Just picked up a new set of rims and now I need some tires to go with them. I went through a bunch of threads and just couldn't find the answer I was looking for. I used a bunch of calculators but to be honest I don't know enough wheels and tires to really make an informed decision.

    Wheel Specs
    Front:
    Size: 19x10
    Backspace: 6.88"
    Offset: +35mm
    Weight: 24.4lbs

    Rear:
    Size: 19x11
    Backspace: 7.97"
    Offset: +50mm
    Weight: 24.5lbs

    I don't necessarily want the wheels to poke out beyond the fender, but sitting close or slightly in would be ideal. Based on the tires I am looking at (Firehawk Indy 500) I don't have to many options but hoping for some helpful suggestions before pulling the trigger.

    Front: 265/40 or 275/40 or 275/35
    Rear: 275/40 or 285/35 or 325/30

    Ideally they are going to be daily driven with a few track days and maybe a pass or two at a drag strip. Daily driving will be the primary purpose.

    Thanks in advance for any help or suggestions. Hoping to order the tires ASAP so I can get them on the rims.
     
  2. Mikepol2

    Mikepol2 Well-Known Member

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    It's not sexy but I have stock GT350 wheels and tires and they work great... 295/35-19 front and 305/35-19 rear. Front wheels are 19 x 10.5 ET30, rear 19 x 11 ET62. The fronts tend to tramline a little too much for my tastes so when it's time to replace them I'll be going with 285/35-19 fronts and keep the same 305 rears. As I understand it, wide fronts are important because our cars tend to understeer, and the wide fronts help make the car more neutral; however, they also make it more annoying to drive when you don't feel like pushing it.
     
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    ChaoticFury09

    ChaoticFury09 Well-Known Member

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    Thanks for the information. Still tough making the right call.
     
  4. Templarum

    Templarum Member

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    When I first got mine I thought something was wrong because it was all over the road. I've heard some anecdotal stories claiming that the Michelin Pilot Sport 4S do a good job of combating the tramlining, but I always thought that it was simply a consequence of the wider footprint. Given all of the other good things I've heard about these I'll probably buy a set once the Goodyear all-seasons need replacing.
     
  5. zxd9

    zxd9 Well-Known Member

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    Here's some useful tire/wheel info I accumulated while trying to make a decision myself.
    I have a PP so stock is:

    Ford PP Wheels
    19x9 Offset +45 32.5lbs
    Backspacing 165.8
    19x9.5 Offset +52.5 32.4lbs
    Backspacing 179.7

    ---------------------------------------------------------
    Indy Firehawk Tread Width
    265/35/19 9.4"
    275/35/19 9.6"
    285/35/19 9.8"
    325/30/19 11.4"

    275/35/20 9.7"
    285/35/20 9.8"
    305/35/20 10.6"
    ------------------------------------------
    mm inches
    255 10.03
    275 10.82
    285 11.22
    295 11.61
    305 12.00
    315 12.40
    -------------------------------------------
    vs stock front
    a 9.5" ET33 front with 255/35R20 tires will have more clearance and 12mm farther out
    a 9.5" ET33 front with 275/35R20 tires will have more clearance and 22mm farther out
    a 9.5" ET40 front with 275/35R20 tires will be 5mm closer to suspension and 15mm farther out
    a 10" ET35 front with 275/35R20 tires will have same suspension clearance and 20mm farther out
    a 10" ET35 front with 285/35R20 tires will be 5mm closer to suspension and 25mm farther out

    vs stock rear
    a 10" ET40 rear with 315/35R20 tires will be 7mm closer to suspension and 33mm farther out
    a 10.5" ET45 rear with 315/35R20 tires will be 12mm closer to suspension and 28mm farther out
    a 10.5" ET45 rear with 305/35R20 tires will be 7mm closer to suspension and 23mm farther out
    a 10.5" ET45 rear with 285/35R20 tires will have more clearance and 13mm farther out
    a 11" ET50 rear with 305/35R20 tires will be 12mm closer to suspension and 18mm farther out
    a 11" ET50 rear with 315/35R20 tires will be 17mm closer to suspension and 23mm farther out

    -------------------------------------
    Sidewall height
    Front
    255/40 102mm
    275/35 96.25
    285/30 85.5
    285/35 99.75

    Rear
    275/40 110mm
    285/35 99.75
    295/35 103.25
    305/30 91.5
    305/35 106.75
    315/30 94.5
    315/35 110.25
    325/30 97.5

    ----------------------------------------


    Overall Height
    Stock
    255/40/19 27"
    275/40/19 27.7"


    265/35/19 26.3" 10" wheel
    275/35/19 26.6"
    285/35/19 26.9"
    305/35/19 27.4" 11" wheel
    315/35/19 27.7"
    325/30/19 26.7"

    275/35/20 27.6" 10" wheel
    285/30/20 26.8 "
    285/35/20 27.9"
    295/30/20 27"
    295/35/20 28.1"
    305/25/20 26" 11" wheel
    305/35/20 28.4
    315/35/20 28.7
     
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    ChaoticFury09

    ChaoticFury09 Well-Known Member

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    Thank you for the information. That is helpful but all I seem to be figuring is out is my the Firehawk's won't work for my rim choices. I can't seem to find a rear that is large enough. Otherwise it will be very similar to the front. I am not sure if that is a problem from a driving perspective.
     
  7. Bluemustang

    Bluemustang Well-Known Member

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    Why not look at MP4S? You can get 305/30R19 which is a better fit to a 19x11 than the 325 Indy would be.
     
  8. Bluemustang

    Bluemustang Well-Known Member

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    FYI, wider tires will tramline more not less. So the wider "footprint" wouldn't help at fighting tramlining.
     
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    ChaoticFury09

    ChaoticFury09 Well-Known Member

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    I’ve considered it. Mostly due to the crazy cost here in Canada.

    Would the 325 work on not so much?
     
  10. Bluemustang

    Bluemustang Well-Known Member

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    The 325 Indy is a tiny bit on the larger side for 11" wheel but it's okay. Just not an ideal fit persay.
     
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    ChaoticFury09

    ChaoticFury09 Well-Known Member

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    Is there any risk there? I would hate to have a blowout on a track day or any other issues.
     
  12. BmacIL

    BmacIL Enginerd

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    On an 11" wheel there's no safety risk. The handling will be a little sloppier and breakaway less gradual.
     
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    ChaoticFury09

    ChaoticFury09 Well-Known Member

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    Hmm, that doesn’t sound great. I’ll have to give it some thought. Maybe I’ll go smaller.
     
  14. AlbertD

    AlbertD Well-Known Member

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    Is it an option to get 19x10 for the rear as well? If so, the ideal setup would be 285/35 on 19x10 at all corners. Great fit, handling and rotatable. The 10/11 setup on track will introduce more understeer to the car and based on the tire selection available for the Indy... looks like there would have to be some compromise for the rear tire fitment for the 19x11.
     
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    ChaoticFury09

    ChaoticFury09 Well-Known Member

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    Unfortunately not. The set is staggered right now. I could look into that for the future but it’s not feasible right now.

    I may just have to suck it up and go 305 in another brand if I can’t get the Indy. It’s too bad they don’t make it in 305. That way I can run 275 up front and 305 in the rear which seems to be ideal from what I can tell.
     
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