I looked through the gearing primer, and I couldn't see anything. I'm building a MTB, and for the moment, it's going to be a SS until I can afford gears. It's going to be used for proper Mountain biking in the West Coat of Canada, with a lot of long sustained climbs, with some short steep stuff thrown in for good measure. I've got a pretty good road and SSFG Background, and a season of mountain biking, so I've got leg strength, and I can also spin like a banshee. I've just got no idea where to start. Suggestions?