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Discussion Starter · #1 ·
I have tires on my 57 that are 27" tall when aired up on rims.

Next I have a 14x5 rim for the spare tire.

What I would like to find is what tire would fit on the rim I have and measure 27" tall when aired up that will be narrow enough to fit in the spare tire well of a 57 Chevy.

The reason is I have a posi trac and it would be better to use a tire that has the same height.

Any help appreciated.

I was thinking maybe one of the old style belt ply tires might work.

Thanks

Otis
 

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The stock '57 tire was a 7.50-14 which is about 27.8" unloaded diameter and 7.5" wide section width. Loaded rolling radius was 12.9" and 784 revs per mile.

"This first system developed for tire sizing was used until the late 1960s, but provided only the cross section width of the tire and the rim diameter in inches. If the section width ended in zero (e.g., 7.00-14 or 7.50-14), the tire had a common aspect ratio of about 92. For section widths not ending in zero (e.g., 8.25-15), the tire was considered "low profile" with an aspect ratio of about 82"

Do you know the maximum tire width that would fit in the spare well? I'm not sure what the 7" and 8.25" refer to. Maybe I'll check on my sedan. ;)
 

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Discussion Starter · #5 ·
The stock '57 tire was a 7.50-14 which is about 27.8" unloaded diameter and 7.5" wide section width. Loaded rolling radius was 12.9" and 784 revs per mile.
So if I were to order the above tire from Coker tire etc, what size should I ask for

Thanks

otis
 

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I'm not sure what the 7" and 8.25" refer to. Maybe I'll check on my sedan.
I believe that refers to the size of the spare tire well. It is wider at the top and then gets smaller at the bottom.
Terry
 

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Using the tire calculator at http://www.miata.net/garage/tirecalc.html it's going to be hard to find a 7 1/2 inch wide 14 inch tire that's 27 inches tall, you might have to go with a 15 inch spare...

A 185/85-14 would be 26.4 inches tall and around 7.28 inches wide, if you can find one...
 

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I know a 185/75 tire will fit in to the stock spare tire well.

I believe a 195/75 will as well.
 
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