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What is the best size tire for 20×9.0″ wheels?

Discussion in 'Model S: Interior & Exterior' started by BestRadar, Jan 23, 2017.

  1. BestRadar

    BestRadar Member

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    What is the best size tire for 20×9.0″ wheels? to match existing 19" overall dimensions?
     
  2. PaulusdB

    PaulusdB Mayor Gnomus Vintage Limb

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    Option A: square 245/40-20 is the best match for 19" dimensions (square 245/45-19)
    Option B1: staggered; front 245/40-20; rear 255/40-20
    Option B2: staggered; front 245/40-20; rear 265/40-20
     
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  3. SomeJoe7777

    SomeJoe7777 Marginally-Known Member

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    20x9 wheels fit tire widths 245 and 255 ideally. A 235 tire is the minimum and a 265 tire is the maximum for the wheel. 245 is maximum for the Tesla front wheels to prevent rubbing while turning in reverse.

    Original fitment tires are 245/45R19, with a diameter of 27.7". Acceptable tire diameters will be within 2.5% of 27.7", but ideally you should stay within 1% to minimize speedometer error and vehicle navigation calibration.

    245/40R20 tires are an exact match for diameter - 27.7", +0.0%.

    Other acceptable tires for this wheel are:

    255/35R20 (rear only) - 27.0" diameter, -2.5%.
    265/35R20 (rear only) - 27.3" diameter, -1.4%
    255/40R20 (rear only) - 28.0" diameter, +1.1%.
    235/45R20, 28.3" diameter, +2.2%
    265/40R20 (rear only), 28.3" diameter, +2.2%

    So, my two recommended options:

    Square setup: 245/40R20 on all wheels, exact match for factory tires.

    Staggered setup 1: 245/40R20 front, 265/35R20 rear for a -1.4% difference from factory, and -1.4% difference from the front tires.

    Staggered setup 2: 245/40R20 front, 265/40R20 rear for a +2.2% difference from factory, and +2.2% difference from the front tires.

    Another option is to change to 20x10 wheels for the rear. This wheel fits 265 and 275 tires ideally, giving the following option:

    275/35R20 (rear only) - 27.6" diameter, -0.4%

    Staggered setup 3: 245/40R20 front, 275/35R20 rear for a -0.4% difference from factory and -0.4% difference from the front tires. (Requires 20x10" wheels on rear axle).
     
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  4. BestRadar

    BestRadar Member

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    Appreciate the detailed response. Since I already acquired the 20x9 wheels it looks like I have to stick with 245/40R20's but I wanted an all season performance run flat but cant find any in that size. Guess I will have to go with a regular tire and hope I dont get a flat :(
     
  5. PaulusdB

    PaulusdB Mayor Gnomus Vintage Limb

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    Of you're going 10" in the rear, mount 285/35-20.
    (That's close to my summer setup, btw.
    Front 8.5" ET 32 245/40-20
    Rear 10" ET 35 285/35-20)
     
  6. Magomboman

    Magomboman Supporting Member

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    Thanks SomeJoe7777 I went with option 3 for my set up.
     
  7. artsci

    artsci Sponsor

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    I have a staggered set up with 275/35ZR-20s on the rear.
     
  8. Tsportline

    Tsportline Vendor

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