The section width of the 315-17 and the 305-18 are basically identical. I don't know for certain, but it could very well be that the two tires share the same mold and casing, with the exception of the bead/sidewall and lettering.
I found out that you can do it. I am running them on the purner wheels, but in Super Stock I have to run the stock width. Chances are, I will will get new "halfs" and run a 11 or 12 inch wheel and run SM2.
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