I've had a few sets of Kwests, 700Cx35mm on a hybrid, and 26"x1.5" on my MTB commuter and my tandem. The 100psi 26" version feels really squirmy on the tandem if I don't have them near max pressure, they feel like they're about to roll off the rim (though that's never happened and I try to keep them fully inflated.) They're cheap & durable, but definitely not a performance enthusiast's tire.