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Farm Tire Size Conversion Chart

05/23/2012 by Pete's Tire Barns

If you own an antique tractor, many times it may be difficult to find the correct tire to replace your old tractor tire. Check our our Antique Farm Tractor Tire Size Conversion Chart for more specific tire sizing.

Tire Size Conversion Chart

 

I
1932-1940

 

II
1938-1960

 

III
1955-Today

           

Old Conventional Size

Original Rim Width

Old Wheel Base Size

Rim Width

Today's Size

Rim Width

7.00 5.5 8 7 8.3 7
7.50 5.5 9 8 9.5 8
8.25 6 10 10 11.2 10
9.00 6 11 11 12.4 11
10.00 6 12 12 13.6 12
11.25 8 13 13 14.9 13
12.75 8 14 15 16.9 15
13.50 8 15 16 18.4 16
9.00-40(I) and 9-40(II) are NOT the same size tire!
Add your rim size to tire size. For example:
If you have a 24" rim..... 750-24 = 9-24 = 9.5-24

Source: m.e.Miller Tire

 

 

Article Author: Ray Turilli
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