I had an interesting experience today. I went for my first ride on my new Michelin Pro3 Race Road tires. Right off the hop I felt like something was different. It was as though my bike was rolling more smoothly, and as the ride progressed, the feeling became more pronounced and I actually felt like I was going faster. Sure enough, at the end of my ride my avg. speed was about 1-1.5km/hr higher than what I was typically putting out on my old tires. Is that possible? How can swapping out one set of slick tires for another set make any difference? Weird. Anyway, I googled it and came across this chart. Apparently there is a difference between tires. Here's the original site.
2 hours ago