Originally Posted by Cynikal
This may not be the best measure because of the added resistance of the derailers. I tried this years ago and wound up with a gear that was too easy.
True, but it will give you a good starting point. It can't be any less useful than asking a bunch of strangers on the internet. Maybe a better idea is to figure out a ratio that works on a geared bike, then add a tooth or 2 in the front, or lose a tooth in the back.