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PostPosted: Mon Aug 13, 2018 5:30 pm 
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page 14 of 27
6.5.2 Modification Factors

Tire Size:
NASA Section Width 266mm or smaller (DOT-approved)
Or any currently produced size 245 or smaller =+.6
NASA Section Width 267mm to 282mm(DOT-approved)
Or any currently produced size 275 = +.3
(Note: Deletion of the use of labeled tire size occurs May 31, 2018)
Size 9.5” (241mm) or smaller (non-DOT approved) = +.6
Size 10.5” (267mm) to 9.6” (244mm) (non-DOT approved) = +.3


are size 10.5" non dot approved tires subject to the "nasa section width" procedure?
or is any non-dot approved tire labeled 10.5" or 267mm to 244mm good for the +.3?


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PostPosted: Sun Aug 26, 2018 8:48 am 
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I missed this
6.5.1 definitions 3)non dot tires use the number on the side

so, for example, the s80 265/645/18 has a listed section width of 10.9" but it is stamped 265 and gets the +.3.


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