I used to ride a borrowed Panasonic track bike many years ago. The bike was my roomates who was a messenger in NYC. What a beautiful ride. Never had breaks on it! and lite as a feather. Anyway after looking at all the pics and posts in this forum I am now setting my sites on building one. I saw a really cool one in town yesterday and here is what I think I saw? It looked like the rear wheel had two sprokets on it. one on each side of the hub. So is it possible that this guy has it set up so that he can 'change gears' by flipping the wheel around? Has anyone sceen this befor. I basically live in the mountains now but the town is sort of on a high plain. So for commuting a fixie would be great except for some of the bigger hills and I was wondering if this is what this guy has set this up for???