Tire dimensional information
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Old(s) Fart
Joined: Mar 2007
Posts: 50,802
From: Northern VA
Good question. It's apparently a made-up measurement that is the sum of the section width and O.D. I guess this is just a way to characterize wider vs. narrower tires of the same diameter. Here's a definition from the NHTSA:
E. SIZE FACTOR DETERMINATION
The actual size factor, which is the sum of the average tire section width and the outer diameter, is computed by the testing laboratory. The result is recorded on the test report in the space provided. The actual size is required to be equal to or greater than the preprinted minimum size factor.
The actual size factor, which is the sum of the average tire section width and the outer diameter, is computed by the testing laboratory. The result is recorded on the test report in the space provided. The actual size is required to be equal to or greater than the preprinted minimum size factor.
Thread Starter
Old(s) Fart
Joined: Mar 2007
Posts: 50,802
From: Northern VA
There are a lot of those "equivalency" charts on the web, but I find that I don't always agree with their selections. That's why I prefer to get actual dimensions and pick the tires myself.
Connoisseur d'Junque
Joined: Sep 2010
Posts: 21,183
From: The Hudson Valley
The ones I have show nominal dimensions, rather than equivalences, but actual dimensions are apparently subject to the whims of the gods.
This one is my favorite, though I do not recall where I got it originally:
- Eric
This one is my favorite, though I do not recall where I got it originally:
- Eric
Last edited by MDchanic; Feb 1, 2017 at 07:01 AM.
Thread Starter
Old(s) Fart
Joined: Mar 2007
Posts: 50,802
From: Northern VA
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POKANOKET
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Jul 14, 2007 02:58 PM
