Originally Posted by genejockey

The Circuit also has Biopace chainrings. Weird things, they are Makes setting the height of your front derailleur an adventure, I can tell you. I THINK I was feeling them a bit, riding on a slight incline in the small ring. Felt kinda surgey. Maybe. Apparently they're set up almost exactly wrong. That is, they're largest when you can only put the least power through the pedals, but apparently if you turn them 72 degree clockwise (move them to the next crank spider arm), they are almost in phase with modern oval rings, which are largest when you're at the highest power.

That's my next magical trick.