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Allis Chalmers Discussion Forum
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Re: Increased Tire size

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Author  [Modern View]

03-30-2013 07:05:28

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It seams that a lot of people get things mixed up thinking a 11 and a 11.25 tire are the same not realizing the difference in the way of measuring. Now converting them up to the new sizing the 11 becomes a 12.4 while the 11.25 becomes the 14.9 and the 11.25 was orignally used on a rim perhaps only 2/3 as wide as the tire from the factory and they think because the new way of doing things is the sidewall should be straight but that is not the way these old tractors were designed. That 11.25 size was measured by the cross section HEIGHT of the tire while the new 14.9 will be measured on the cross section WIDTH of the tire on a rim with the sidewalls straight and as they do not know anybetter because they are too young to have ever seen the orignal tires they do not think things look right because they do not know what the orignal looked like. Me I do remember those old size tires and unless the beads are pulled in they do not look right.

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03-30-2013 09:23:16

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 Re: Increased Tire size in reply to Leroy, 03-30-2013 07:05:28  
There also seems to be confusion on the 13 tire with people thinking the 13.6 is the same size but it is not, the 13 became the 14.9. The 13.6 derived from the 12 tire that evolved from the 10.00 tire. the 11 tire evolved from the 9.00 tire and later became the 12.4. the 13.50 became the 15 and I do not know off hand what that evolved to but possibly the 16.? or the 18.? as the 16.? probably came from the 14 with no XX.XX equivilant.

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