Ford Mustang: Tire Sizes and calculations

15" 225x60x15
16" 215X60X16
17" 205X60X17


As for original tire size for your car, most likely an original E78X14,
which would equate to a 205X70X14


Bill S.



elmo wrote:
 

Why does the width get skinnier as the wheel gets taller? Why couldn't you
stick with the same width, just a shorter aspect ratio? like 225x45 17"?

Scott Williams

"Bill S." <net> wrote in message
news:sCF3b.9370$srv.hcvlny.cv.net... 
15" 
the 

http://www.miata.net/garage/tirecalc.html

This site will show tire size comparisions with overlays and speedometer
differences.

You would definitely need to switch to a lower aspect ratio. On a
235/60x14, your outside diameter would be 25.1 inches. To maintain that
same OD, or close, using a 16" rim, you'd need to use a 235/50x16, which
would give you a 25.25 inch OD. The same width tire in a 45 aspect ratio
would be 24.3 inches OD, which would be too small. It's desirable to
maintain the same OD in order to not affect your speedometer readings. The
0.15 inch difference in the 235/60x14 vs. the 235/50x16, would be negligible
(slightly over 1/8 inch overall).
--
RayS
2001 Mustang GT Bullitt #3320


"Scott Williams" <net> wrote in message
news:com... 
to 
idea 

OK, so I was sorta right, even though my math sucks.

Scott Williams
'66 HCS

"RayS" <NoChance@All> wrote in message
news:supernews.com... 
negligible 
15% 
making 
when 

You are correct,my original posting was done far too early in the AM,
and without the benefit of any coffee first...............As you go up
in rim diameter, the side wall aspect must come down..................


Bill S.



Scott Williams wrote: