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shimano biopace ?(10 posts)

shimano biopace ?preacher
Oct 10, 2002 1:48 PM
I am wanting replace my biopace chainrings with tradition round ones. Does anyone know if the crank arm will work with other chainrings or only biopace rings?
thanks
re: shimano biopace ?tmac13
Oct 10, 2002 2:02 PM
About a year ago, I replace some 105 Biopace rings with regular and did not have to change the crankarms.
re: shimano biopace ?DaveG
Oct 10, 2002 2:27 PM
I believe the bolt pattern is the same. However, its probably cheaper to replace the entire crankset then to buy rings
Are they worn out?Ahimsa
Oct 10, 2002 4:07 PM
What do you intend to do with them after replacement?

A.
sell them. are you intersted? nmpreacher
Oct 11, 2002 3:48 AM
For sure, it's a straight bolt-oncory
Oct 10, 2002 4:49 PM
the bolt circle is round and it measures whatever the standard five-bolt diameter was in those days--I can't remember, but it's common. You should be able to get rings anywhere. I still have a couple of bikes that use it (that bcd, not biopace), and I had to put new rings on one of them just a couple of months ago.
But why do you want to replace them?Mel Erickson
Oct 10, 2002 5:19 PM
Surely they were a solution looking for a problem but they do work fine. If they're worn out I can see replacing them but I'd have to believe they're on an older, mid to lower end bike. If you want to put the money into them, fine, but I bet you could replace the whole crank (with probably better quality) for less than new rings. I've got a biopace crank on my commuter bike and it'll be their til it dies, which will be alot longer.
good observationpreacher
Oct 11, 2002 3:59 AM
Very good observation. Yes, I purchased this bike to be used as a winter "trainer" bike and would like for it to assimalate my road bike as much as possible. Also, I'll be doing some specific intervals (high cadance, low resistance, isolated legs, etc) in which I believe the biopace would not be beneficial. thanks
good enough reasonsMel Erickson
Oct 11, 2002 5:51 AM
I'd just replace the crank. Some have the Race Face Prodigy at a really good price. It's a basic OEM type crank that would do the job. LX would be good and can often be had cheaply.
thanks, thats helpful. nmpreacher
Oct 11, 2002 4:00 AM