Re: [AMC-list] Tires For My Matador.

[Ken Ames <ameskg@xxxxxxxxx>]

Well, it may not be THE trick, but it is one. 
A simple formula will convert the tooth count (assuming a 904/998/727 with 13
teeth on the drive gear cut in the tailshaft) and differential ratio to a driven
tooth count (also assuming the speedometer wants 1,000 rpm cable speed for 60 mph).

Also note that the calculated tire circumference (based on tire size numbers)
will probably not directly convert to the actual rotations per mile. I've seen
the RPMs vary quite a bit for tires that are supposedly the same size. 
These 2 are supposed to be 1975/75-14s:
http://s143.photobucket.com/albums/r122/AMCKenA/?action=view&current=NC155.jpg


Ken


Quoting Marc Montoni <Freedom@xxxxxxxx>:

> 
> Ken Ames <ameskg@xxxxxxxxx> said:
> 
> 
> >I'd expect the radial equivalent will be 195/75-14. 
> >If you want to get rally fancy, check the number of teeth on the
> speedometer
> >driven gear - on the end of the speedo cable at the transmission. That'll
> tell
> >you the number of revolutions per mile the tire should have. Width is then
> up to
> >you.
> 
> 
> Hmmm...  Never knew that was the trick.
> 
> I prefer to go with the largest optional tire.  The big body wheel wells
> could accommodate up to H78x14, which should be 27.6" tall.
> 
> A 27.6" tall old-style tire would translate to a 221/78-14 in current
> parlance.
> 
> 221/78-14       6.8"    13.8"   27.6"   86.6"   731/mi  60MPH   10000mi      
>   N/A
> 235/75-14       6.9"    13.9"   27.9"   87.6"   723/mi  59MPH   9891 mi      
>   1.1%
> 235/70-14       6.5"    13.5"   27.0"   84.7"   748/mi  61MPH   10230mi      
>   -2.3%
> 245/60-15       5.8"    13.3"   26.6"   83.5"   759/mi  62MPH   10376mi      
>   -3.6%
> 255/60-15       6.0"    13.5"   27.0"   85.0"   746/mi  61MPH   10194mi      
>   -1.9%
> 265/60-15       6.3"    13.8"   27.5"   86.5"   733/mi  60MPH   10019mi      
>   -0.2%
> 
> Only problem is that it's really, really hard to find any tires in the
> correct height to fit 14" wheels.
> 
> This is a fun tire size calculator, for anyone interested:
> 
> http://www.powerdog.com/tiresize.cgi
> 
> Whatever happened to John Mahoney?
> 
> 
> 
> ------------------------------------------------------------------------
> MARC MONTONI
> Richmond VA
> http://FreeVirginia.blogspot.com/
> Freedom.  Responsibility.  www.LP.org 
> Cu vi parolas Esperanton?
> I'd rather push a Rambler than drive a Toyota.
> Visit www.AMCRC.com or www.AMONational.com .
> http://RichmondRambler.tripod.com/
> http://Hasdrubal.tripod.com/Index.htm
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