29er Bikes
I'm running a 33/22 combination for a 1:1.5 ratio. This seems to be OK for me on a 2000ft climbing 16 mile ride last weekend. Maximum speed on the flats is about 17MPH, all spun out. I can comfortably cruise at around 13MPH.
I've seen a lot of 26er singlespeeds geared at 32/16 for a 1:2...