Agreed. I've been riding a KMC 7-speed chain on my fixed gear for many, many miles and have *never* had a problem with the chain climbing. With a chainring/cog with straight teeth, it just won't happen. (Incidentally, it's the chain that came with my Rush Hour). OTOH, I'm running the same type of chain on my SS MTB, but with a cassette cog (which has lifters, etc), and even with a straight chainline if the tension is too light, the chain pops right off. I don't know if a BMX chain would fix it (it would probably help), but I'm sure a proper SS cog would (but I'm too cheap to drop the $25 on one right now).