Johnny Ringo wrote:

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the car probably had 7.50 or 7.75 x 14's . I run 215 /70's in front and 245/60's x 14 in back of my 58. Looks and sits right , 3.36 gears.

TIRE SIZE CONVERSION TABLE www.dbtires.com/crossreference.html


try the link for tire sizes

 

.....on my 49 truck that I just did, I used 215/70x14 in front and 235/60x15 in back, they are same height.  You need to see how much room you have for rubber before you pick a size.  60's are wider than 70's wider than 75 series. 

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          Don't forget.. that if you are trying to be "perfect" in your sizing (some are)  

          that 775-14 bias ply or any bias ply  may the same height as the radial you pick out  

          BUT radials have a different loaded static height    

          example   a 28 inch "bias ply" may sit 14 inches from the middle of the rim to the ground

                    and a 28 inch "Radial ply" may sit 12.5 inches from the centre to the ground  

                    Thats the distance that affects your gear ratio.......