Dunlop Refines the Roadsmart IV Series

[Grumpy Goat]

Since I've gotten my RS I've always put on Michelin RP 4 or now 5. To my memory I've never had the GT version.
I'm happy about that.
It sounds to me the GT means more load carrying capability which implies at least a stiffer / stronger side wall and maybe a less flexible belt (less flex, temp build up).

I have had a PR5 GT on my RS once when the dealer did not have a standard PR5 and it appeared to be no different than the standard one, may have been a little stiffer due to specs, but without scientific measurement (as opposed to subjective "butt-feel") it is hard to tell. Wore similarly as well.