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While ride quality and fuel consumption can be a variable of tire profile, load rating and sidewall stiffness will determine "pothole" survivability for the tire. In this case they are both adjusted to essentially be equal. What WILL be more of a "pothole" survivability variable will be for the wheel itself, which in the case of the wider lower profile tire, would edge in favor of the 18" wheel. However in this case THAT is offset by the fact that the 19" wheels are forged rather than cast (as are the 18" wheels), which makes the 19s much stronger - and hence the biggest difference towards the added cost.
Wear (which is not a profile variable but rather one of compound and pressure) is out of the comparison as I expect there is more difference in compound or even manufacturer between these options. And I feel "pothole" survivability won't practically vary much between them either...
Just my 2¢ -
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