Originally Posted by MrCjolsen

I've heard of these springy things that keep your chain tensioned. Some guy I know, even has his tensioner thingy connected by cables to controls to make it slide back and forth sideways. And he's got this wheel with like a whole bunch of different sized cogs on it. It kind of looks like a corncob. That means he can change cogs without having to flip his wheel around (that wouldn't work anyway, since all the cogs are on the same side for some reason). This guy said that he can even change cogs while the bike is moving and it works better than when he did it at a stop.