Originally Posted by humble_biker
Now we're getting closer to the OP. So you're saying that the force on the chain is equal regardless of when it is on the high or low point of the BP CR?
No, I said the
average tension is the same.
There will be slight variations due to the non-roundness, but the magnitude of these variations is much smaller than, the variations that normally occur duing the pedaling cycle.
The maximum tension will be slightly higher, probably about the equivalent of using a chainring 2 or 3 teeth smaller, but the average will be the same.
Bottom line, I do not believe that there is any difference in chain wear with Biopace chainrings compared with round or even traditional ellipticals.
Sheldon "It's An Imaginary Problem" Brown