Sorry to go on and on about this, but I just can't get over how fast I seem to be going these days since my tyres were pumped up to a state of roxolidity. It's not that I'm even making a real effort - I just seem to glide effortlessly past road racers, into headwinds and up hills. I think it's going to get even better if, come summer, I take the plunge and get a road bike with SPDs.