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Originally Posted by Spuds
Another interesting bit about the tires they tested. The 225s are have an "XL" load category and are rated for more weight than the 245s, which are "SL". Not sure what that actually means in terms of tire structure, but that might have something to do with the results.
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This is what I found on bob is the oil guy forum, I am quoting a member here but interesting answer
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Some tire manufactures offer the same tire model in a Standard Load and an XL version. The XL version might have a 2 ply sidewall while the Standard Load version may have a 1 ply sidewall. You might get a better ride with the 1 ply sidewall while the 2 ply version could provide better steering response.
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