21.12 less revs per mile than stock wheels/tires?

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  • Maluco
    R3V OG
    • Oct 2005
    • 6572

    #1

    21.12 less revs per mile than stock wheels/tires?

    While chillin on this slow day at work I was playing around on discount tires' "tire calculator" http://www.discounttire.com/dtcs/infoTireMath.dos and it shows I am getting 21.12 less revolutions per mile than would the "Original Equipment Tire Size". I was just wondering what impact/affect does this have on the engine/transmission etc?
  • Maluco
    R3V OG
    • Oct 2005
    • 6572

    #2
    I guess this could have been posted in the engine/drivetrain section, hunh? Mods can you move me over if so, sorry.

    Comment

    • Brew
      No R3VLimiter
      • Oct 2003
      • 3060

      #3
      Originally posted by the 84 318i
      I was just wondering what impact/affect does this have on the engine/transmission etc?
      None.
      '91 318is
      sigpic

      Comment

      • nando
        Moderator
        • Nov 2003
        • 34844

        #4
        22.2* the circumference of your tire (in miles) is how much your odometer is coming up short. it's not going to be very much..
        Build thread

        Bimmerlabs

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        • Ziggens96
          Grease Monkey
          • Aug 2005
          • 340

          #5
          how much does a speedometer/odometer calibration cost? I was planning on getting 195/60/14 tires but the odometer being off makes me nervous...the speedo issues wouldn't really bother me.
          sigpic

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          • MR 325
            Moderator
            • Oct 2003
            • 37833

            #6
            Originally posted by Ziggens96
            how much does a speedometer/odometer calibration cost? I was planning on getting 195/60/14 tires but the odometer being off makes me nervous...the speedo issues wouldn't really bother me.
            Uh, that is the stock size
            BimmerHeads
            Classic BMW Power Delivered Worldwide
            Grover Beach, California
            BimmerHeads.com

            Comment

            • Addissimo
              E30 Mastermind
              • Mar 2004
              • 1820

              #7
              Originally posted by MR 325
              Uh, that is the stock size
              195/65-14 is actually...


              errr... at least thats what my original spare is.

              -Addis

              Doing something M50 related? -> http://www.addissimo.com
              On Myspace? ->http://groups.myspace.com/r3vlimited
              BF2142 SN = BillyGoose

              Comment

              • nando
                Moderator
                • Nov 2003
                • 34844

                #8
                there are three stock sizes, depending on your model:

                195/60-14 (usually early 318)
                195/65-14 (all 325?)
                205/55-15 (M3, ix)
                Build thread

                Bimmerlabs

                Comment

                • Axxe
                  No R3VLimiter
                  • Aug 2004
                  • 3355

                  #9
                  Originally posted by nando
                  there are three stock sizes, depending on your model:

                  195/60-14 (usually early 318)
                  195/65-14 (all 325?)
                  205/55-15 (M3, ix)
                  195/60-14 is what my car says on the door jamb. Must be an 87 thing.


                  Keep it slideways!!

                  Comment

                  • Digitalwave
                    is a poseur
                    • Oct 2003
                    • 6299

                    #10
                    Early models have 60 series and lates have 65.

                    RISING EDGE

                    Grassroots racing, properly overthought.

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