Ahh.I see.Now i got thinkin i mite get something like that, cause im rigth before a knee surgery myself, and i need to recover nicely.Any ideas where can i get a c.r. like this?or is it totally custom made for him.
yeah but all it does is keep his pedaling smooth and helps him pedal more efficient since every millisecond counts for World Champs. He should be fine on a normal chainring, and there is no real reason why you would spend probably hundreds of dollars getting a special chainring made for a few months of recovery time unless your racing highly competitively.
He had knee surgery sometime before the race, so his one leg was less powerful then the other. this chainring keeps his pedaling more consistent. it works like the old Shimano BioPace did.