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Any one use Biopace (oval) chainring on commuter bike?(6 posts)

Any one use Biopace (oval) chainring on commuter bike?c722061
Jun 3, 2003 5:19 AM
I just bought an old steel bike to use as commuter bike, It comes with Biopace chainrings. I've read many good things about them. I wonder if any of you have this kind of chairings on your commuter bikes and how do you like about it?
I've got 'em on my commuterMel Erickson
Jun 3, 2003 6:25 AM
See no need to replace them. Can't say I've heard good things about them but to me they're benign. Don't really notice them. They were a gimmick, a solution looking for a problem. Lukily, unlike some gimmicks, they really didn't degrade performance but aren't an improvement, either. If they don't bother you (apparently some can feel and are bothered by the motion) just use them.
Never could get used to them, but my wife still has 'emSilverback
Jun 3, 2003 8:08 AM
We bought a couple of low-end mountain bikes when Biopace was popular, and they both came with it. I replaced mine within a week or two, but my wife loved hers and still uses the bike as a commuter/beater, what, 10 or 12 years later?
You probably know the theory--you have less resistance where your pedal stroke is weak and more where it's strongest, to even out something or other. I'd ridden with round rings for so long, though, that they screwed up my spin, which didn't have much room for deterioration.
I dumped mineMelMo
Jun 3, 2003 8:19 AM
I recently got an unridden, garaged 80's Miyata touring bike that came with Biopace. I gave it an honest try, but then I ripped it off. I couldn't seem to maintain as fast a spin with them, and when I was going up hills in the granny ring (it's a touring bike, and I live in Seattle) it was like being on a stairmaster--stomp, stomp, stomp. Truly awful.

Ride it for a week or two and if you don't notice, great. But I suspect you'll want to change it.

Melinda in Seattle
re: Any one use Biopace (oval) chainring on commuter bike?Infini
Jun 3, 2003 8:56 AM
I've got an old bike with biopace. One thing I'd reccomend is to not use clipless pedals. It is supposedly hard on your knees if you use clipless pedals with biopace cranks. (I have confirmed this myself).
I don't have that bike here to look at, but I've read that the biopace design is actually such that the pedals turn slower through the harder spots.(while they are moving horizontaly, which is the opposite of what someone said above). There were other cranks designed so that the pedals are turning slower while moving up/down, and I guess those just didn't work very well at all.
re: Any one use Biopace (oval) chainring on commuter bike?laffeaux
Jun 3, 2003 11:07 AM
I had them on an old MTB and never noticed them. I used the bike off-road and in the winter on my trainer and had no trouble spinning or riding with clipless pedals. Most people that tell you how bad they are have never tried them. I'm fairly indifferent about them.