Winter Tire Downsizing

Discussion in 'Reality Check' started by Lex Lucas, Oct 26, 2020.

  1. Lex Lucas

    Lex Lucas
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    feels good.

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    OEM tires are 265/45 R21, would 255/50 R20 be sufficient for winter or should I downsize the diameter of the wheel more?
     
  2. Boots

    www.reality-check.ca

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    you'll throw off your speedo if you adjust from the overall stock tire/wheel diameter but I don't think you'd have any issues other than that.

    https://www.willtheyfit.com/

    Enter the before / after there and it'll tell you all the details
     
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  3. Lex Lucas

    Lex Lucas
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    feels good.

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    Already looked at that previously and I was within 1-2% variation.

    My current wheel size is from an upgraded trim option package. The downsize size I put for the 20s is what would come with the car otherwise if I didn't get the trim package.

    I guess my question is you hear people saying you should downsize for winter to increase side wall and was wondering if going down to the 20s mentioned is sufficient or if I should reduce rim size more and make up for it with a larger sidewall tire.
     
  4. Boots

    www.reality-check.ca

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    I haven't heard anything about increasing side wall but I've read that you want to go narrower in winter. Wider tires are more likely to ride on top of snow than cut through it.
     
  5. Cheddar

    Red is the New Green

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    265 isn't that wide but the nice thing is that you get a little more forgiveness with potholes with the higher sidewall. I'm surprised though that dropping a wheel size and 1cm in width only changes your aspect rating by 5. You sure that's right?
     
  6. David Puddy

    yeah, that's right

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    the difference in prices between 21" and 20" tires is significant. i imagine that's why you want to switch to 20"
     
  7. 17

    17
    teenage dirtbag

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    If you can clear the brakes I’d go 18”
     
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  8. Lex Lucas

    Lex Lucas
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    Surprisingly, the winter tires didn't vary that much in price from 18-19-20-21. At least not as much as I was expecting.

    Reason? to increase sidewall for comfort?
     
  9. Lex Lucas

    Lex Lucas
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    feels good.

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    correct
     
  10. 17

    17
    teenage dirtbag

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    more comfort and more cushion for all those shitty potholes that you cant see as easy in the winter like you can in the summer.
     
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  11. Wayne

    Well-Known Member

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    I'd go 19 or 18" for reasons 17 said

    I went to 17" on my Volvo, stock 19's
     
  12. RoryTate

    Buffer the streaming media unto me.

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    The last few vehicles I've done a proper -1 fitment - down one inch in rim size, and narrower width while maintaining the (darn near) same circumference as not to throw off the speedometer too much. I managed to save a couple bucks in the process.
     
  13. David Puddy

    yeah, that's right

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    i plan on going from 20 to 21 for next summer and the tire prices are a huge jump. but also looking forward to running 18" this winter to see what the cushion is like
     
  14. PirateSteve

    Moderator

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    My car has 235/35/19 summers and I run a 225/45/17 winter. The rolling dia is within tolerance and like mentioned above the slightly less wide gets through snow better and the extra sidewall is good for hidden potholes. We downsize lots of cayennes and x5s to 18s for winter packages
     
  15. David Puddy

    yeah, that's right

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    you get any old folks in their cayennes that want to get rid of their big summer wheels, lmk looking for 21 or 22
     
  16. PirateSteve

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    Haven't yet but I'll keep you in mind if I come across anything.
     
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