Yeah, there are! I just checked, and there's a bunch of NOS items in a bunch of different tooth counts. Kind of funny... Biopace really seems like a relic to me.Bikinfoolferlife said:Biopace kinda flopped a long time ago, I'd be surprised if there were very many functioning rings still around now (altho if they are, they're probably on ebay).
As I understand it, Shimano put some load cells on a pair of pedals and attempted to match the chainring leverage to the rider's output. The result was cadence dependant so the big rings were less oddly shaped than granny rings and chainrings for higher performance groups were less ovalized than for groups intended for recreational groups.bsdc said:Biopace is an interesting idea. It's slightly ovalized chainrings that were suppose to add leverage on the down stroke and reduce leverage through the dead spots. I'm not aware of any scientific tests, but most people didn't feel that it really did any good.
O.symetric is oval like Biopace but tilted 90 degrees, having a different effect on pedaling efficiency.Bikinfoolferlife said:Biopace kinda flopped a long time ago, I'd be surprised if there were very many functioning rings still around now (altho if they are, they're probably on ebay). There's always the newer version, the o.symetric (osymetric.com) chainrings...or perhaps the offset cranks from rotorbike.com.
Have you contemplated why this product was inevitably such a failure in the marketplace? Even with all of Shimano's muscle behind it (it was virtually all that was available on lower end bikes for a few years) it didn't last. Do you suppose there was any chance that it was because it didn't really work, or worse, was actually a performance decreaser? You should be aware that out of round chainrings have been around for some 100 years in every imaginable shape, and yet none of them have caught on. Plenty of anecdotal examples, like Bobby Julich right now, but they never have any staying power. It might make you wonder if they are anything but useless. But if you think they "look cool" then what more can be said?FeltS22TimeMan said:Besides being a part that constantly gets "whats that" remarks it will probably just look cool. If its good enough for Bobby Julich its good enough for me.
I have a set of rings in a spares box somewhere. Had them on a bike for a while, liked them when they were fashionable and I was a masher. As my knees aged and I developed a better spin, I found that I preferred round rings.FeltS22TimeMan said:Does anybody else still use the Shimano Biopace besides me?? I cant find information on it anywhere and no body seems to remeber it. I just threw it on my felt S22 time trial and am planning to use biopace on the next time trial (10 miler).