Km2s have a softer sidewall, and are very compliant when aired down. At lower pressures, with weight on the tires, the sidewalls are softer and the overall measured height is smaller. And yes this is pretty common knowledge that km2s measure smaller when mounted. My km2s are more compliant at 15psi than a toyo mt at much lower pressures. So I don't have to be as concerned about losing a bead.
You could go with a much stiffer tire that is significantly heavier if the extra 1/2" of clearance makes all the difference in the world. You'll lose more mpg, and decrease acceleration and braking performance. Every tire has its weak and strong points.
Technically it is technical related. Especially when we get talking about sidewalls and tire flexibility when aired down. Plus the fact that the OP put them on a JK.
Speaking of air-down compliant, I suppose it has to do with the load-rating of the tires. Toyos are pretty-heavy duty, and they're also one of the heaviest tires on the market. I presume the load-rating is way up there, too.
My Hankook Dynapros are advertised at 33.6" and are 33.2"/30psi--installed on 16x8-1/2" rims
Thats odd, my hankook dynapros are advertised at 34.6 and measure to 33.75
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