Originally Posted by
mvnsnd
I'm not sure I am going to give up on the biopace just yet, but I want to try the round rings. I'll ask about the series of the Ebay ring. As for the smaller ring, I just meant tooth count. I'm not to hung up on making everything match. I'll keep my eyes open.
Try rotating the BioPace 144-degrees clockwise (2 holes). It will do the opposite of Shimano's intention and even out the torque-variations around the pedal-stroke. I've found that it really helped me get a more even roar out of disc-wheels in time-trials. Several pros use modern version of oval rings and they have oriented this way as well.