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  1. 11-18-2015 10:49 AM #1
    jzinckgra
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    245/45R18 vs 245/40R/18

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    My 2013 A4 has 245/40R/18 tires. I'm looking at getting a used set of A2 Sport rims with Blizzak 245/45/18 tires for winter. I'm aware of the increase in tire size, but would these be too big and will they rub? I have another set of Nokian winters that are 40R, so I could always have those put on the A2 rims. Basically, I just want a 2nd set up rims/tires for winter so I don't have to heep peeling tires off audi rims 2x a year.
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  2. 11-18-2015 11:02 AM #2
    The Infiltrator
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  3. 11-18-2015 11:08 AM #3
    4ringnut
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    I rock 245/45/18 with no problems. At least with stock ride height. I lowered my car in the spring, and haven't installed the winter wheels yet.
    Pedal Responce first responder.
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  4. 11-18-2015 11:50 AM #4
    o1turbo30v
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    To keep your overall tire diameter within 3% I would go with a 235/45/18. Google tire size calculator.
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  5. 11-18-2015 12:01 PM #5
    Townending
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    Quote Originally Posted by o1turbo30v View Post
    To keep your overall tire diameter within 3% I would go with a 235/45/18. Google tire size calculator.
    Any reason to stay within 3% other than incorrect speedometer reading?
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  6. 11-18-2015 12:20 PM #6
    jfo
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    Quote Originally Posted by Townending View Post
    Any reason to stay within 3% other than incorrect speedometer reading?
    The diameter difference is 25mm or about 1". This might be a problem if the original spare had to be used on a quattro model. I can't find the original reference I saw with Audi's recommended max tread wear difference, but this would certainly be greater. Perhaps not an issue for a short drive?
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  7. 11-18-2015 03:28 PM #7
    shayan_a4
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    i had a set of 245/45r18s and im lowered and i rubbed alot
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  8. 11-18-2015 04:34 PM #8
    4ringnut
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    Quote Originally Posted by shayan_a4 View Post
    i had a set of 245/45r18s and im lowered and i rubbed alot
    Great. What was your drop? And which wheels?
    Pedal Responce first responder.
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  9. 11-18-2015 05:33 PM #9
    o1turbo30v
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    Quote Originally Posted by Townending View Post
    Any reason to stay within 3% other than incorrect speedometer reading?
    Isn't that a good enough reason?!
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  10. 11-18-2015 05:38 PM #10
    Elliott
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    It will also negatively affect your pedal responce.
    CEO and General Manager of the AZ Pedal Responce Team
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  12. 11-18-2015 05:45 PM #11
    blbroo
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    Quote Originally Posted by Elliott View Post
    It will also negatively affect your pedal responce.



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  13. 11-19-2015 07:54 AM #12
    Townending
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    Quote Originally Posted by o1turbo30v View Post
    Isn't that a good enough reason?!
    I guess it depends on the person.

    I'm very close to 3% off on my current setup and I don't even notice the incorrect speedo because its such a small difference. Tire calculators say its off by 1.3mph at 60mph. 1.3mph = not a big deal in my book.
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  14. 11-20-2015 07:42 AM #13
    pwdrskr
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    I use the tire size calculator I found back when I had a BMW 335 located here: http://www.e90post.com/forums/forumdisplay.php?f=12

    I have used this many times when changing wheels/tires
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  15. 11-20-2015 07:55 AM #14
    shayan_a4
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    Quote Originally Posted by 4ringnut View Post
    Great. What was your drop? And which wheels?
    im on solowerk s1 coilovers and on sparco asseto gara wheels
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  16. 11-20-2015 08:26 AM #15
    4ringnut
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    Quote Originally Posted by shayan_a4 View Post
    im on solowerk s1 coilovers and on sparco asseto gara wheels
    I meant how low are you? Fender to the ground.
    Pedal Responce first responder.
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  17. 11-20-2015 01:11 PM #16
    shayan_a4
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    oh honestly im not to sure and im not with my car to be honest, but ill let you know when i get to the car
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