[DML] Re: Speedo gear rpm.
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[DML] Re: Speedo gear rpm.



I love the DMCNEWS.com website, some years ago I found
a great information there....which said 60mph = 1000rpm....

yesterday we swapped speedos and my self calibrated speedo
which shows 60mph @ 1000rpm was only 1-2 mph off compared
to GPS !





--- In dmcnews@xxxxxxxxxxxxxxx, Joe Angell <jangell@...> wrote:
>
> 
> 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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