Biopace warning, Biopace warning!!!!!!!!!!!
bought my touring bike in 90 or 91, it had Biopace---changed them out to round ones after having knee problems. Lets put it this way, there were many other people who had knee problems, and over time it was fazed out. I could not get rid of mine fast enough and even went to the point of throwing them out so that they would not get used on another bike, thats how much I saw them as a problem.
Do some searches on here and you will probably find more detailed accounts, mine included.
I had to put this stuff down as I really disagree with comments that it is ok. There is a "herky-jerkiness" that happens to your knees at faster cadences, and it aint good for your knees.
(my knees are crying out to you, "throw them away, throw them away!"
I had Biopace 52/42 13-26T on my Fuji Club and really loved it. I thought that they felt better at proper cadence. Although not my primary bike, it gave me ~1500 troublefree and fun miles its first year. PG