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Tire size

J

JayinNY

Well-known Member
Why is it that the same size tire according to the numbers is different from different tire manufacturers? Why is
it not universal?
 
There is some variance on circumference. When I changed my duals on my trailer to truck tires I used a tape measure to put the matching or closest matching ones within 1/2 inch on the same hub. I have at least 3 different brands of tires on it and them used truck tires hold out better than those new Chinese trailer tires.
 
That is not something new. 30 some years ago cutting wheat we had to put certain heads on certain trailers to have the heads and combines with the same machine all summer as the Firestone tires were shorter than the Goodyear's thus the heads would not go on certain trailers due to trailer height. There were to many header frames on to many different trailer to make them all the same height. We had 2 semi trailer to haul 2 heads then load a combine on behind them. Then the rest were on regular double header trailers.
 
(quoted from post at 22:57:46 11/15/21) Why is it that the same size tire according to the numbers is different from different tire manufacturers? Why is
it not universal?
Click to expand...

Despite what anyone thinks, it is not in manufacturers' best interests to cooperate with each other. They are in competition with each other, and to that end, they want to lock you into their product so you have to buy from them, not be able to go to any other manufacturer and get "the same thing."

The only way what you propose would happen is if there were strict government oversight, and at this point it would mean that most tire manufacturers would have to completely redesign their molds. It'll never happen because there is too much money involved.
 
The Tire and Rim Association puts out standards for the dimensions of all kinds of tires but these are ranges, not absolutes. What is printed on the side of a tire is simply the nominal size but there is a generous plus/minus tolerance on that to get the actual dimensions.
 
Not just between brands. We sold 235/75-15 6 ply,and they were shorter than the235/75-15 4ply. Same tread made in the same plant. Now the thing no one would ever check, the 4ply were rated heaver load than the 6ply .
 
Could it be that the basic equipment to build a tire stays the same but the tread depth and design of each model of tire causes the variance?

I had a set of Wranglers on a dually with 30% wear on them, 1 rear tire had the sidewall destroyed so I went to buy another for it, none in stock but they did have a tire the same size and rating in an off brand with the same tread pattern.

Figured I would have to take a front tire off to pair up with the height of the rear one.

Mounted it then ran a string around them and to my surprise the new tire circumference was within 1/4 inch of the worn one on the rear.
 
I think this all got started when they began making oversized tires. As in like a 12.5 inch tire fits an 11 inch rim. Carcuse's weren't all molded the same by manufactures at this time .Then rim sizes changed over the years. Like they started making 12 inch rims, and no longer made 11 inch.
I don't think this accounts for all of it, but I think it accounts for a lot of it.
 
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