Originally Posted by Hocam
Same chain tension all the way around?
Uhhh what?
as already stated, in theory yes. in practice about as good as any round ring.
now, the problem arises with the positioning on the biopace. they are only supposed to be mounted in one position (i guess you could rotate it 180* also). they tend to wear a lot on the power portion of the pedal stroke, whereas you can rotate a round ring so it wears more evenly. so a lot of old biopace are already heavily worn, exagerrating tight/loose spots. but this happens with any ring that has not been rotated occasionally.