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    Tire size calculator

    Looking for aftermarket wheels and tires for your E30? Are you wondering what size wheel and tire will land you as close to the stock size diameter as possible? Use this handy tire size calculator to do this!

    BimmerHeads
    Classic BMW Specialists
    Santa Clarita, CA

    www.BimmerHeads.com


    #2
    There was this other one. I forget where it was though, it was at some online tire shop though. You could enter the original size (I think the car too? and it would know?) and like 3 others and it would show how tall they are, rollout, all sorts of things and speedometer error. Anybody know what Im talking about? :\

    Nevermind, found it.

    Here's another then--

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      #3
      good links, thanks for posting!

      Kyle
      1988 M3, 97 840, 99 XJ
      DILLIGAF

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        #4
        my favorite tire size calculator

        Calculator of compatible upgrade tire and wheel sizes


        Lets you explore a range of possibilities all at once
        Bob Sutterfield
        '91 E30 318iS alpinweiß
        '83 E21 320i opalgrün-met (RIP, parting out)
        '93 T4 EV MV Weekender Arktisches Weiß
        BMWCCA #169277 GGC/RMC

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          #5
          Bimmerzone was established in 2001 and has been providing quality parts to 10s of thousands of customers around the US and around the world. We take pride in providing top notch BMW parts, performance and accessories at the lowest possible prices and still maintaining a high quality of customer service.

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            #6
            For those that don't know, the stock size on E30's is:

            195/65/14 for 318i, 318iS, 325i, 325iS, 325iC...

            205/55/15 for 325iX and M3...
            Reminiscing...

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              #7
              Alloy Wheel & tyre fitment calculator - it calculates inset, poke, speedo error, tyre stretch and loads more.


              This is the one I use, I like it fairly well
              Originally posted by Wh33lhop
              If you actually stay within your budget, you are not a true car enthusiast. True story.

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                #8
                I was searching for that site forever. thank you!

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                  #9

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                    #10
                    I made my own in Excel which allows you to see what to expect when changing tire sizes as well. If you want to go from 195/65-14's to 195/60-14's it will give you the effective differential ratio change, which means going to 60 series will be like changing out a 3.73 diff to a 3.85 diff.

                    It also spits out the old vs new tire diameter and circumference in both mm and inches to save some time calculating. Then on another tab it has the typical gear ratio calculator for a 5 spd transmission (you input the gear ratios) up to 10,000 rpm. If anyone wants the file I can email it to you. Just PM me your email address

                    I could also add in speedometer error if anyone is interested

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                      #11
                      1010tires.com

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