Originally Posted by krusty

Just be sure to keep your shovel handy in the probable event that you will want to take my earlier advice.

And yes, I have experience with them. They feel horrible, and when trying to stop on a fixed gear, you may or may not feel a huge backlash in the system, depending on where the pedals are when you start. Also, your chainline must be perfect. If not, the chain will be far more prone to coming off.

BTW, the basic idea has been around since the 1800s, and every once in a while, someone tries to resurrect it. With equal frequency, they fail. Shimano's attempt in the 80s was an attempt to market biking more broadly, as they were touting the easier feel to the pedaling. The dead spot they attempt to correct doesn't exist on a fixed gear.

I dislike them intensely, as you may have gathered, but Sheldon did, in fact, like the feel of them. You may too, just be aware of the possible issues, and make sure your chainline is correct first. BTW, the Biopace HP rings are better than the MTB version.