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So you're saying that they haven't improved the tires since 1970? I find that hard to believe. I don't have anything to offer up as I haven't run the Conti twins since I first got my /7. I am running a set of Continental 3.25x19 on my R25/2...no speed demon for sure but they work fine.
those Conti RB2s and K112s were crappy handling tires when they were first produced,they will have only gotten even worse in comparison to current tire technology.