Gatorskins 650C x 24mm
A big improvement - although I'm running them a little softer (120psi) I'm grateful I have a carbon seatpost with some give, because they're a harsh ride (24mm profile). Fast and efficient though. I did have a slide on a roundabout, so I suspect they either need some breaking in, or the rubber is a much harder compound. I was only going slowly, but it was damp.