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Tractor Tire Sizes

K

kam0327

New User
Hi Everyone.

I recently inherited my parents' Oliver 77 and 88 tractors. I love these old tractors and use the 77 whenever I can, whether using the brush hog in our woods, or food plot work. Today, I was using it in the woods and developed a rear flat. The tire has a poor sidewall and needs to be replaced. I did a quick search on Craigslist and eBay to see what used options might be available. The sidewall is stamped 13 x 38. I see a lot of 13.6 x 38's listed online. I first thought that the 13 was the width of the rim, but I'm starting to think it's the distance from the bead to the edge of the tire. Can someone shed some light on how these are sized? I guess my bottom line question is whether a 13.6 x 38 will work as a replacement. Thanks all.
 
The 13X38 is the old number size and is now what is called a 14.9X38. I just had to buy a new rear tire for my S88 and it had the old number size of 13X38 and put on a 14.9x38 so it would match the other side. The old 12X38 would be what the 13.6X38 is so you would be going down one size smaller which will work but will be a tad bit shorter then the other one you have on it is it too is a 13X38
 
"<font color="#6699ff">[b:654c4848f0][i:654c4848f0]Can someone shed some light on how these are sized?[/i:654c4848f0][/b:654c4848f0]</font>"

Take a look at the following list.

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Hope this helps.
 
13 is the width of the rim. 13x38 is the current 14.9x38. A current 13.6 is the old 12x38 tire, smaller than what you have. The current size markings reflect the size of the "bulge" of the tire...the maximum cross section, while old size markings reflect the width of the rim. So if you stick a 13.6 on one side, it will be smaller than the 13 on the other side.
 
(quoted from post at 19:52:55 08/03/17) 13 is the width of the rim. 13x38 is the current 14.9x38. A current 13.6 is the old 12x38 tire, smaller than what you have. The current size markings reflect the size of the "bulge" of the tire...the maximum cross section, while old size markings reflect the width of the rim. So if you stick a 13.6 on one side, it will be smaller than the 13 on the other side.
Click to expand...

My 1940 M had very rotten 14.9x38 tires when I bought it. I removed those tires and measured the width of the rim. Exactly 11 inches. I bought new 13.6x38s. They fit and look just fine.
 
At one time that 13 x 38 was a replacement tire as your tractor would have come from factory with either a 11 new size 12.4 or 12 new size 13.6 so the 13.6 would be the best for your tractor but you need to make sure both are the same size and from one company to a different one the circumfrunce will vary, same with putting a different size on one side and that difference will make the gears in the differential be turning all the time instead of staying still as they should if you are going straight. Could it have been on the 88 at one time as that is more what the 88 should have had and one went bad on the 77 so was switched to the 77 and new tires put on the 88. The 77 tire should be 1 size smaller than on the 88.
 
While it's not ideal, having two different size tires isn't nearly as crucial on a tractor as on something like a car, where the differential is revolving hundreds of times per minute. You can burn up the spider gears pretty fast on a car with two different size tires.

On a tractor the differential is revolving much more slowly so it is not all that important. Farmers have been replacing one tire on tractors since rubber tires were an option. They tend to replace with the least expensive option available at the time, and it rarely if ever matches the other tire.
 
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