I know the size is terribly out of fashion, but what's good in the 650c size? I see Bontrager has a 650x25c tire, the Race X Lite AC. Any thoughts on that tire? Continental also has the new Grand Prix 24mm tire in 650c. I guess I'm looking for something with some flat protection and half-decent life - basically a training tire, ideally a bit bigger than 23mm. Dunno if these two are more racer than trainer.