Originally Posted by
canklecat
Yup, I noticed that surging too in some chainring orientations, especially with longer cranks. And it felt better to me in "harder" gears and a slower cadence than I normally used.
That's what Biopace was designed for---lower cadences of the sort employed by the majority of casual and non-racer cyclists, aka the majority of cyclists, period.
All of the other eccentric chainring designs, starting in the 1930s, if not earlier, and continuing to the present day, were designed for high-cadence, racer-oriented use.