I've got two bikes with them - the quick commuter has 27X1-1/4's, the road bike has 700X25's. I took the road bike (well, they all are, but my "fast" road bike) on a metric century with the local bike club (my first club ride) and, aside from making the mistake of not breaking in my Brooks Pro and not using padded shorts (i.e. butt hatchet), it was great, and I was able to keep up with carbon wonder bikes with my 12 speed mid-line Nishiki Modulus. The tires certainly didn't let me down in the least. Took the other paselas out with the club last night on their "social" ride. Thought I was going to murder myself out of boredom (honestly, have NEVER used my brakes so much in my life) and loved it. Others were ducking gravel and such, but I was just rolling through with my wide tires and such. Good stuff.