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  • speed stats?

    There stats for speeds from each wheel sizes.

    Like from a average pedal speed on each gives what speed?

  • #2
    um, what?

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    • #3
      I think he's looking for average speeds per unis based on wheel size.

      So:
      20" average speed = ?
      24" average speed = ?
      ...
      36" average speed = ?

      etc.

      Except for personal accounts, I wouldn't think there's anything "official" due to the number of variables involved.
      I dub thee Sir Phobos, Knight of Mars, beater of ass. Be a hitter, babe.

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      • #4
        Circumference of a wheel = Pi x diameter
        Pi = 3.142 approx.
        A mile = 1760 yards = 1760 x 36 inches = 63,360 inches in a mile

        20 inch wheel = 62.8 inch circumference
        24 = 75.4 inch circumference
        26 = 81.7
        28 = 88
        29 = 91.1
        36 = 113.1

        Revolutions per mile:
        20 = 1009
        24 = 840
        26 = 775.5
        28 = 720
        29 = 695.5
        36 = 560.

        Divide that by 60 minutes
        1 mph =
        20 = 16.81 rpm
        24 = 14
        26 = 12.95
        28 = 12
        29 = 11.6
        36 = 9.33

        So take your desired speed, multiply it by the number in the right hand column to get your required rpm

        e.g. 9 mph on a 24 =
        14 x 9 = 126 rpm.
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        • #5
          Originally posted by Mikefule
          Circumference of a wheel = Pi x diameter
          Pi = 3.142 approx.
          A mile = 1760 yards = 1760 x 36 inches = 63,360 inches in a mile

          20 inch wheel = 62.8 inch circumference
          24 = 75.4 inch circumference
          26 = 81.7
          28 = 88
          29 = 91.1
          36 = 113.1

          Revolutions per mile:
          20 = 1009
          24 = 840
          26 = 775.5
          28 = 720
          29 = 695.5
          36 = 560.

          Divide that by 60 minutes
          1 mph =
          20 = 16.81 rpm
          24 = 14
          26 = 12.95
          28 = 12
          29 = 11.6
          36 = 9.33

          So take your desired speed, multiply it by the number in the right hand column to get your required rpm

          e.g. 9 mph on a 24 =
          14 x 9 = 126 rpm.

          what he said
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          www.unicycle.com
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          • #6
            newtouni has a software program called UniCalc (listed under IJ Software). It can calculate speed based on wheel size and RPM, or RPM based on speed and wheel size.

            Alternatively a simple spreadsheet could also do the job based on the numbers from Mikefule.

            A comfortable speed varies depending on the person, crank length, and other variables. A general rule of thumb would be the following. A cadence (RPM) of 100 to 120 is a comfortable cadence for many as a cruising speed. A cadence of 150 or more is fast and takes effort to maintain. A cadence of more than 170 gets to be a sprint and not a speed that you'd maintain.

            You can calculate expected speeds for those cadences for different wheel sizes.
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            Team Never Wash Your Muni
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