just installed a brand new pair of Schwalbe Marathon(regulars) on my Downtube 8FS, pumped up to the max at 100psi, significant improvement on rolling resistance over the Kendas. I had to take the long route for my morning commute thanks to the United Nations general assembly, and I still made reall good time getting to work.

PS, I had real hard time removing and installing all the tires with a 1.50 width, the original Kenda 20X1.75 rear tire was so much easier. Any suggestions and advice?