speed stats?

um, what?

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markf

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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.

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bmemike
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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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Mikefule

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But choked by weeds.
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Mikefule said:

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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musketman
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newtouni has a software program called 'UniCalc'
(http://www.ironjungle.com/) (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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john_childs

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