have used Rivendell Ruffy-Tuffy tires on 700C Super Champion 58 rims at 110 psi on a tandem. Maybe you have a bad match of rim and
I can attest that Rivendell Ruffy-Tuffys are hands-down the best clincher tires I've ever ridden, for tandems in particular, but even for single bikes, if you don't mind a little extra weight...they're probably as close to flat-proof as a clincher can be, they have an incredible, ocean-liner ride, and they corner beautifully..in addition, they seem to be faster (less rolling resistance) than any other clincher I've tried (and although I dislike clinchers in general, I've tried quite a few now)...
If there were any justice in this world, Grant Peterson could retire on the profits from his tires..maybe he should make them in all-black. He could sell a bazillion of them. The Roly-Poly might, on balance, be the best clincher tire ever made...a paragon of the virtues, with no vices.
Well. One vice. Or two. They aren't made in a 27", and they aren't made in a wire-bead. Other than those two caveats...best clincher ever, in my view
Charles Andrews SoCal
that's the puzzle of what has happened to the automobile world: feeling safe has become more important than actually being safe.