Joe of Loath wrote:
............and going down again isn't as fun as it would be on a geared bike, but I guess more fun than a fixie as I can coast!
the thing on a fixie is your cadence has to match the speed of the bike, and so speed is "limited" but gravity might have other ideas going downhill. Can be managed using front brake but can get through blocks / rims quickly, some people still use a rear brake while riding fixed but that's not ideal.
Back in the day the gearing was about 70", I rode 40x15, cadence of 120rpm is about 25mph I seem to recall so long steep hills to be avoided.