Originally Posted by MoAlpha

Well, dress me up and call me Suzie; GP4Ks really are faster than 4Ss! They're only the third set of tires I've had on the road bike after starting to ride it again in 2014.

Also, one has to pick one's line more carefully with 23 mm tires than 25s. Imagine that! The feel is a little like $18 tubulars, back in the day, but not quite as good.

I wonder what it's like to ride a bike that weighs less than 22 lbs.