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looking for tire chart

A

Anonymous-0

Well-known Member
I would like to find a chart on line that tells me the circuferance of tractor tires. In my case I want to compare 13.6 and 14.9 and 15.5 by 38 inch tires. I am considering replacing 14.9 x 38s with 15.5 x 38s. My manual says they all were available from factory on my tractor.
 
IMHO go around and measure the tires you are thinking of, for yourself. Any chart would be inaccurate, tires are like clothes and shoes, the sizes of different manufactorers don't match up.
The rim width the tires are mounted on, will vary the height also.
 
Below is a link to the Firestone Ag Site.

Click on the style of tire for details, then click on "dimensions and loads".

Of course, as the other poster said there will be SOME size variation between manufacturers.
Tire specs
 
Absolutely agree with opinions below. I have two sets of 15.5x38's I would swear are different size tires! It may not be as dramatic in other sizes, but there are still differences. I think it has gotten worse since tires come from around the world instead of just from around this continent.
 
replacement tires are 100 miles away. Old tires are down to nothing. I just wanted to get a idea of how much, percentage wise, one size was bigger than another,. I compared the same model tire to itself but in the larger or smaller sizes. I found something odd on the site recommended to me here below. The 15.5 tires had a smaller outside circumfurence than the smaller 14.9 tires. They had the same numbers as the 13.6 tires for distance around the outside.
 
On those tires the 15.5 is like a 60 series in a car tire and the 13.6 is like the 75 series. 75 is tall tire and 60 is short-low tire. These figures right out of a Goodyear tire book on a Dyna Torque II, rolling Circ. 13.6 X 38 = 184.2", 14.9 X 38 = 186.8", 15.5 X 38 = 189.7" and static loaded radius 13.6 = 28.5", 14.9 = 28.7", & 15.5 = 28.8". I ran duals of 13.6 X 38 against 15.5 X 38 on the tractor and they stood very close to same height.
 
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