# speed stats?

There stats for speeds from each wheel sizes.

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

um, what?

I think heās looking for average speeds per unis based on wheel size.

So:
20" average speed = ?
24" average speed = ?
ā¦
36" average speed = ?

etc.

Except for personal accounts, I wouldnāt think thereās anything āofficialā due to the number of variables involved.

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;)

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 youād maintain.

You can calculate expected speeds for those cadences for different wheel sizes.