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Tractor tire width

M-MAN

M-MAN

Well-known Member
Location
Bostic, NC
The post on tractor tires got me to thinking about sizes. It's confusing to me.

From what I can find the sizes were supposed to have changed around 1960. I went out and did some measuring on old & new. The 11.2x24 is actually just a hair under 10. Small box below size says (10x24). Another is 12.4x24. It measures 11. Small box below says (11x24). An almost new 13.6x28 measures 12.2. No small box under it with a different size.

Width is consistently an inch less than tire size whether old or new so where is the change that was supposed to be there?
 
Change was made in 1954, not 1960. Change was to measure size at the bulge at the bottom of the tire sidewalls, called "section width", not measure the tread width.

I'm sure if you did an Internet search, Google or other, there would be ASAE papers that completely explain why the change was made.
 
They did not change the actual physical size of the tire.

10-24 became an 11.2x24, same tire, different number.
11-24 became a 12.4x24, same tire, different number.
12-28 became a 13.6x28, same tire, different number.

Now tires are starting to come with Metric sizing.
 
Yes I did the search and read the explanation. Also says you go up a size with modern tires and you will have the same size as the old. That's the problem. What it says & I measured don't jive.

According to the internet articles that 12.4 tire is supposed to be the exact same tire as the old 11.2x24. It isn't.
 
Another caveat is rim width. I have 3 Fords with 13.6x28s. 2 have Kelly Springfield and marked on the tire are the words: "on a 12" rim". The other is a later model with 2 different mfgrs. tires and have no reference to rim width. Apparently it's 13" as side by side they look a lot different.
 
How can they say they are the exact same size when you measure a Firestone 13.6 and a Goodyear 13.6 and they are not the same size?

Some brands are a bit taller or wider than the other manufacturer.

Those numbers and just a suggestion.
 
Both are bigger. It is not the same tire.

Barnyard's chart must be the correct one. If the old has an even number you go up a size. If it doesn't there is no change.
 
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