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Working on an historic relic of a tractor with the almost 90 year old factory original 11.25-24 tires. Yes, 11.25-24, a prewar tire size. I believe as tire standards progressed, this is equivalent to 13-24 and finally 14.9-24. Can anyone confirm this, and what are some suggestions for finding cost effective tires and tubes?
The 1949 edition of the Tire and Rim Association Annual lists the 11.25-24” implement tire appropriate for either a W-10H or W-8H rim. The sizes you list are correct for a 2” wider rim. I looked on eBay and sellers have the 11.25-24” listed. Stu
Okay, somewhere I have a few old French and Hecht references that I can dig out tomorrow. Are the rims a lot different than other ag rims? Do they have a unique tire bead and seat, and does it need a specific tread profile? It would seem that the same width issue would apply as any other ensuring that the tires are appropriate for the rims. Stu
The French and Hecht reference I found is much too new to apply to your tractor. No help there. The guy in the first linked reference describes using uniform tire size molds over time with (as I read it) progressively wider carcasses thus improving performance. That would strike me as only of use to you if you had the ability to use progressively wider demountable rims. Your spoke wheels have fixed drop center rims of unknown width. Not sure what to make of the other discussion thread.
Rim width is the critical factor. If your tires are 11.25-24”, the below 1935 Tire and Rim Association charts again show an 8” rim. Your picture shows the rim to be a drop center one piece, as in the schematic diagram. And, assuming yours are like the diagram, have a 5° bead seat profile like more modern tires. So verifying rim width of your wheels should settle it. Stu
Edit - I must have read that first linked article eight times and feel more confused each time I read it.
One thing to do is to call the author of the article you linked and discuss it. He listed his phone number. The other is to rely on your tire vender. A reputable local ag shop you’d think would have seen similar situations over the years. If a size larger than the 11.25-24 is recommended and it turns out wrong they should be able to make it right. Stu
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