Re: [DML] Speedo gear rpm.

[Joe Angell <jangell@xxxxxxxxxxxxxxxxx>]

I don't know what it is officially, but I did the math out and got  
~2030 RPM @ 85 MPH.  I'm assuming that one turn of the tire is equal  
to one turn of the speedometer cable, but I'm not entirely sure if  
that's the case (there might be some kind of gearing at the angle  
drive that I don't know about; I'd appreciate it if someone could  
confirm this):

Here's the math, based on the diameter of the front tire:

	Tire Circumference:        43.98" = 14" diameter tire * pi
	Tire Revolutions per Mile: 1440   = 63360" per mile / 43.98"
	Miles per minute @ 85 MPH: 1.41   = 85 miles per hour / 60 minutes  
per hour
	RPM of front tire:         2030   = 1440 * 1.41

You can get the RPMs at any speed with this formula:

	RPM = (MPH / 60) * 1440

Obviously this value will vary based on the amount of air in your  
tires at any given time, but hey.

-- Joe

> Does anyone know what RPM the speedo cable operates at?
>
> Bob



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