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tractor tire sizes

A

Anonymous-0

Well-known Member
What year did rear tire sizes change from inch by diameter in inches to the inch plus decimal by diameter in inches. Seems to have been around 1960. 13/38 became 14.9/38, 10/28 became 11.2/28
 
I'm not sure- some say mid 50s, but Dad bought a new WD45 in October '56, and it had 13x28 on it- now the 14.9. Maybe a gradual thing, depending on mfgr? I'm thinking the D17, 1958, had the 16.9x28 from the start. D14 came out in '57, IDK what it had, other than a 26 inch diameter- thought that was a step backward.
 
I have seen a number of tires that have both sizes marked on them, but new tires do not seem to have both. I wonder how long companies were doing both or if some companies went from old to new size designations without a transition period.
Zach
 
Old designation was:

width - diameter

New designation is:

width.decimal X diameter

Very important to use the dash (or slash) and the "X" in the correct places.

They went to the decimal width to make the tires sound bigger.
 
(quoted from post at 09:14:30 09/18/12) I'm not sure- some say mid 50s, but Dad bought a new WD45 in October '56, and it had 13x28 on it- now the 14.9. Maybe a gradual thing, depending on mfgr? I'm thinking the D17, 1958, had the 16.9x28 from the start. D14 came out in '57, IDK what it had, other than a 26 inch diameter- thought that was a step backward.
Click to expand...

I think the 13x28 was replaced by the 13.6x28. The 14.9 was one size larger than the 13.6, but would fit the same rim.
 
It is my understanding that the old way of measuring tire width was at the bead, thus the even widths 10, 11, 12, 13, 14....Then it was changed to measure the width at the widest point on the sidewall, thus a 10 became 11.2; 11 became 12.4; 12 became 13.6; and 13 became 14.9.
 
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