TEN MONTHS without a Biopace discussion? Gotta fix that!
Had to dig through my box of chain rings yesterday to find a SS ring.
So many more Biopace than round rings! I think a bunch were take-offs from Colorado Cycle when they were new.
They hurt my knees, and looked foolish.


Worst was this one, came on my Cannondale tourer. Uphill it felt klump-klump-klump JUST like a flat tire.


They did have a second generation that was rounder. Here's a comparison.

Since I'm older now and my cadence is way down, I may give the rounder one a try.