Asthmatic single speed gearing

Perfect for who?

I am fairly fit but 68 is slightly too high for my terrain and my perfect ratio is around 64. For riding slowly and up hills 68 is on the high side for someone who may not want to be pushing too hard.

Likewise (apart from the fairly fit bit).

67 was too much for my asthma and the 17% gradient found at some point in every direction from home. After a year of bloody mindedness and ventolin I gave in and fitted gears offering 40 - 72 (ish) and use around 63 much of the time.