Re: [AMC-list] How Fast Am I Going

[Ken Ames <ameskg@xxxxxxxxx>]

Many of the TSMs have tire revolutions per mile (RPM) for the various tire sizes
over the years. You'll then get a new tire with comparable RPMs to the original
size. 
Mine aren't here or I'd look it up. 

Ken


Quoting Frank Swygert <farna@xxxxxxx>:

> You really need the gear ratio too. But you can figure the difference between
> the tire sizes just by stating any rpm and gear ratio, then change only the
> tire diameter. I use the tire size and gear calculators at www.4lo.com only
> because it's an easy site to remember. Forget about the "LT" in front of the
> tire size, and put a "1" in for the transfer case ratio (1:1 = no t-case
> reduction). Use "1" for the trans ratio (high gear in a three speed, manual
> or auto).
> 
> You will also need to find the equivalent P-metric tire size for an E78-14 or
> the approximate diameter of an E78-14. Should be able to find that in a
> search. The tire size calc at 4.lo will give you the diameter of the
> 185/78R15.
> 
> ------------------
> Date: Fri, 22 Jul 2011 10:53:38 -0500
> From: Jack Jefferson<pajack1939@xxxxxxxxxxxxx>
> 
> I have a 1966 Classic with a 232 6 3 speed overdrive. The car came with
> little E 78 14 tires. I now have 185 78 15 tires installed.
> 
> My question is what is my actual horizontal rate of velocity at 60 MPH
> indicated with the 195s installed?
> 
> -- 
> Frank Swygert
> Publisher, "American Motors Cars"
> Magazine (AMC)
> For all AMC enthusiasts
> http://www.amc-mag.com
> (free download available!)
> 
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