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


Your calculation of the number of revolutions the tire goes through in a 
mile is way off.  You used the diameter of the tire in the place of the 
circumference.  The circumference of a 23.23" diameter tire is 72.97". 
Thus the revolutions per mile of the tire = 63,360" / 72.97 =~ 868.3 
revolutions per mile.

However, that assumes that there is a 1:1 gear ratio between the wheel 
and the speedo cable (that the speedo cable spins 1 revolution for every 
1 revolution of the tire).  Is this the case?

Jon Heese

Bruce Benson wrote:
>  The 195/60/14 tire is 23.23" in diameter. A mile = 5,280 feet x 12"= 63360" 
> . Divide that by the tire's 23.23" = 2727.5 revolutions per mile. 60 mph is 
> a mile a minute so at 60mph the speedo gear is turning 2727.5 rpms.
> Bruce Benson
> _______________________________________________________________________
>> 6a. Speedo gear rpm.
>>    Posted by: "Bob Brandys" BobB@xxxxxxxxxxxxxx bob6351
>>    Date: Sun May 4, 2008 5:24 pm ((PDT))
>> Does anyone know what RPM the speedo cable operates at?
>> Bob
>> Messages in this topic (4)
>> ________________________________________________________________________


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