Tire Size Calculator

Discussion in 'General' started by drimportracing, Jun 20, 2010.

  1. drimportracing

    drimportracing Pizza driver: 61,000+ deliveries

    This is good if you are considering changing your wheel or tire sizes to increase fuel economy and want to know how far off your speedometer or odometer will be.


    - Dale
  2. CapriRacer

    CapriRacer Well-Known Member

    A Word of Caution:

    This, and many other tire calculators, do not factor in that the rolling diameter of a tire is about 97% of the overall (freestanding) diameter. As a result, their revs per mile are typically off 3%.

    This affects many other calculations, especially when they do gearing and MPH calculations.

    But for comparing tire sizes, the error is small enough to ignore.
  3. litesong

    litesong litesong

    Out of the blue, I came across this really old thread discussing tire size comparisons if people want to change their car's tire sizes. Yes, when I changed to larger tire diameters (& widths) for my cars, I used tiresize.com & was very happy with their results. Because of the unusual way tire sizes are defined & measured, websites comparing tire diameters are necessary to help fit tires of other than OE sizes, so your fitments should & will be acceptable to your car. Fortunately for me, my mechanic of 26+ years also helped make sure that my selected over-sized tires did fit my cars, making me very happy.
    BillLin likes this.

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