What if you can't spin?

dogsballs, at the moment this 48x17 is really good, and I can go up gentle inclines without standing, but I think that if I have to head up Pentonville Road, I'd probably walk up.......til I've lost some weight, and increased my leg strength. But its flat speed I'm after. Anyway, hills are for mountain goats http://photography.nationalgeographic.com/cgi-bin/pod/PhotoOfTheDay.cgi?day=21&month=4&year=05

I cannot believed you walk up Pentonville Road on 48x17, I have 48x16 and occasionally I have to cycle up that hill, but it's not steep enough to get off the bike, but I still managed to get up to the top without stopping and getting off.

edited; you got asthma, that make sense, didn't read the whole thing properly, my apologise.