Re: [DML] Speedo gear rpm.
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [DML] Speedo gear rpm.

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


To address comments privately to the moderating team, please address:

For more info on the list, tech articles, cars for sale see

To search the archives or view files, log in at! Groups Links

<*> To visit your group on the web, go to:

<*> Your email settings:
    Individual Email | Traditional

<*> To change settings online go to:
    (Yahoo! ID required)

<*> To change settings via email:

<*> To unsubscribe from this group, send an email to:

<*> Your use of Yahoo! Groups is subject to:

Home Back to the Home of PROJECT VIXEN

Copyright 2006  All rights reserved.

Opinions expressed in posts reflect the views of their respective authors.
DMCForum Mailing List Archive  DMCNews Mailing List Archive  DMC-UK Mailing List Archive