And back to 1x ... a friend is perma-lending me an old aluminum cervelo P2 frame. I'm thinking of building it up with a 52 single chainring and 11x28. I figure that spins out around 42 mph and still gives me a small enough gear to get up small hills. I could also swap a 54 on there for super flat courses. I figure the bike will heavy enough that it wouldn't be ideal for any course requiring small ring climbing anyway, and the aero benefit of no FD is meaningful.