I too have an SS mountain bike. Currently I'm riding a converted Kona Lava Dome. The link to the MTBR.com's FAQ is a good read should you want to venture into the SS MTB world. Very helpful people over there. You're probably not seeing any SS/fixed mountain bikes since you're not looking in the right place. Most SS mountain bikes are geared pretty low to allow for easier climbing rather than straight away, between a cab and a bus sprints! Riding my Kona on the road SUCKS! She's better pointed at the rocky trails here in NEPA, rather than the asphalt jungle.