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Newb question on tire size?

This is a discussion on Newb question on tire size? within the Wheels and Tires forums, part of the General Help category; Right now i have 275's all around with 17" rims. I'm probably going to sell both the tires and the ...

  1. #1
    Rice Hungry GottaHaveLS1's Avatar
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    1999 Trans Am M6

    Newb question on tire size?

    Right now i have 275's all around with 17" rims. I'm probably going to sell both the tires and the rims. I'm looking to get 18"s. Is there an optimal tire size such as 275, or 315, ect and position (such as front or rear) for just driving on the street. I never go to the strip but i do fly around on the streets alot. Any recommendations?

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    Crazy Canuck ! Eugenio_SS's Avatar
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    2000 CamaroSS convertible

    if you going to change tires/wheels, just remember to maintain the same overall diameter (OD) of the wheel.
    for that, you have to understand what the #s mean.
    On a 275/40-17
    275: 275mm of width of tire
    40: sidewall is 40% of 275mm = 110mm = 4.33"
    17: rim size, in inches = 17"

    So OD = sidewall + rim + sidewall
    OD = rim + 2x sidewall
    OD = 17" + 8.66" = 25.66"

    So similar size tires would be:
    245/45-17
    275/40-17
    315/35-17
    245/40-18
    275/35-18
    315/30-18

    Then you have to make sure you have a wide enough rim for any given size, and make sure the offset is adequate to avoid rubbing.
    imho, the wider the better, but make sure you do it safely
    Hope this helps.
    Eugenio_SS
    almost stock triple-black 2000 SS convertible with 17x11s on all 4 w/ 315s at the track or on the street with 18x10.5s on all 4 w/ 315s: (1), (2)

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    Member wabmorgan's Avatar
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    Artic White
    96 Formula Firebird

    when it comes to height of the tire.... doesn't tread deth also affect it this???

  4. #4
    I Fixed Da Rear jimbo98z's Avatar
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    Mystic Teal
    1998 Z28 M6

    Quote Originally Posted by wabmorgan
    when it comes to height of the tire.... doesn't tread deth also affect it this???
    Tread depth may have something to do with it, but it's mostly the type of tire. Some brands of tires may be a little taller than others, even though they are technically the same size. It is very rarely a problem though. You will see varying tread widths to. A higher performance tire will generally (not always) be a little wider than something like a touring tire in the same size.

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