Hmmm. Should've known I read that on Sheldon's site. Right now I have a Biopace chainring on the bike and the non-circular shape of the ring causes a slack-tight-slack-tight I can feel more than I care for when I get the rpms high enough.

Why are you running that big of a gear anyway?
When I got the bike the inner chainring (42t) was bent. The outer ring (52t) was in really good shape so I set up the single speed usinging that ring. So I run 52 in the fron and 18 in the rear. It would be plenty easy to take it down to a 42 tooth (do 42/16) but none of the bike shops I went to had 52 or 42. One shop said they have a 42t middle ring (I assume for a triple front) but stated that middle rings are not good for use on a single speed.