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Largest width rear tires for 21" wheels

Discussion in 'Model S: Driving Dynamics' started by artsci, Jan 13, 2017.

  1. artsci

    artsci Sponsor

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    Just curious. With 21" wheels what's the widest rear tire one can mount that won't rub?

    Compared to the stock 245/35-21 tires, 285/30-21s are 1.6" wider and virtually the same height. 295/33-21s are 2" wider and .2" higher. 305/30-21s are 2.4" wider and .4 inches taller. Any clearance issues should be on the inside fender well which I suppose could be fixed with a modestly wide wheel spacer.

    Any thoughts or experiences that can enlighten me?
     
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  2. ifung90

    ifung90 Member

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    I am running a 21x11 et29 wheel with 285/30/21 rear. However if u are low, you'll rub. I would run 21x10.5 et30-33 offset and run 285/30/21 safely
     
  3. AMPUP

    AMPUP Member

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    I run 275 on the staggered gray turbine setup, no rubbing here. Was thinking of adding spacers like you but that may cause the rubbing especially as I have lowering links.
     
  4. artsci

    artsci Sponsor

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    This question regards the 21" arachnid wheels which I'll be getting in the spring. I already have spacers that will result in et30. Are you saying with that set up 285/30-21 would not rub? That's kind of what I'm thinking.
     
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  5. artsci

    artsci Sponsor

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    I'm currently running 275/35-20s on the rear and have no rubbing issues when the car is lowered, and that's with the 18mm spacers. I think the lower offset the spacers produce eliminate the rubbing.
     

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