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anybody run biopace?

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anybody run biopace?

Old 08-25-07, 01:23 PM
  #1  
dijos
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anybody run biopace?

i have a biopace ring, and was thinking about installing it after reading sheldon's site. for those that have done it, do you like it, hate it, no difference?
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Old 08-25-07, 01:50 PM
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it works....i used biopace on a ss but the tight,slack,tight,slack makes me nervous. i wouldnt use it unless you just had the crank set lying around already.
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Old 08-25-07, 03:13 PM
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Originally Posted by dijos View Post
i have a biopace ring, and was thinking about installing it after reading sheldon's site. for those that have done it, do you like it, hate it, no difference?
It would probably work 'best' on a SS conversion that had a chain tensioner. I've never been sold on the whole biopace thing, myself...
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Old 08-25-07, 03:17 PM
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all i'm saying is, there's a reason why you dont see 'em often :X
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Old 08-25-07, 03:32 PM
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it makes chain tension all wonky
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Old 08-25-07, 03:34 PM
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I have a soft-spot for elliptical chainrings, though I've never run one myself. Good Luck!
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Old 08-25-07, 03:40 PM
  #7  
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Send a PM to Ken Cox. He has been running biopace for at least a few years.
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Old 08-25-07, 05:05 PM
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I rode one last week for the first time, i love biopace! it was ss though.
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Old 08-25-07, 05:13 PM
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wasnt it a gimmick by shimano targeted to triathletes to supposedly conserve energy in the 'running' muscles in your legs?

i tinks day fugly
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Old 08-25-07, 05:25 PM
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it wasnt a gimmick.. i'd say it works, so does sheldon..
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Old 08-25-07, 05:40 PM
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Yeah, FWIW, it's definitely Sheldon-approved. For a while, I think he had BioPace on all his bikes, and may still.
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Old 08-25-07, 05:44 PM
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he has them on all his fg/ss
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Old 08-25-07, 05:47 PM
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I was just reading a research article on elliptical chainrings. Seems like the theory/science behind them is pretty solid, though that's not really what you were asking for. I've actually been tempted to buy one before they're all entirely gone. I think sheldon sells some few remaining biospace rings?

I dig the idea.
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Old 08-25-07, 06:27 PM
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I used one for a year on my fixed conversion commuter, probably 2000mi on it. Had no problems with tension, and really liked the feel of it. Its subtle, but your power application does feel a bit smoother. I broke the ring earlier this summer due to a lose chainring bolt, and I was too lazy to find another one. But I'd say its definitely worth trying out.
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Old 08-25-07, 09:01 PM
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If you try them, make sure you orient them correctly when you put them on. There's a mark (arrow or something, don't really remember) that ends up hidden behind the crankarm when it's set up right.
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Old 08-25-07, 10:14 PM
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the chain tension does not vary wildly like many of you are suggesting. the ring is not perfectly elliptical (there are some extra anglke changes engineered in there to assist with biomechanics), so there is a tiny bit of varying tension, but not much: within the tension nchanges from all the other out of roujnd things in your drivetrain, like crank arm mounts, BB, and cog. if the rings were perfect and symmetrical ellipses, it would not vary at all, just like with a round ring. the same number of teeth are in contact with the chain at all times, just the angle that that chain runs onto the ring changes slightly as the ring rotates. i have run biopace on my SS, no need for a chain tensioner. in fact, i get more chain tension variation from the ****ty out-of round ACS freewheel than from the biopace crankring.

i don't run biopace any more as i have changed cranks to a campy with Blackspire chain ring (135mm BCD). If you find a Biopace ring in the size you want, and they are 130mm BCD, then try it out. the 40 and 52 are the easiest teeth sizes to find, others were non-standard.
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Old 08-25-07, 10:30 PM
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I have a 42 and a larger (maybe 51) lying around, I rode the 42 for a while on my conversion but had tension issues that scared me since I was new to the whole fixed thing. The logic seemed sound and I remember liking it on my old road bike.
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Old 08-25-07, 10:30 PM
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I use it, and find the benefit noticeable. If you try it and have problems with chain tension, you're doing it wrong.
You can usually get NOS biopace chainrings super cheap at bike shops since most people have no idea what they are anymore.
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Old 08-25-07, 10:31 PM
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Originally Posted by Straws View Post
he has them on all his fg/ss
He's not riding anymore right?

How about on a fixed gear and skids? Anyone?

Last edited by deathhare; 08-25-07 at 11:21 PM.
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Old 08-25-07, 10:51 PM
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I just saw a ton of these at a bike swap today. Maybe I'll try one out, they were pretty cheap.
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Old 08-26-07, 12:08 AM
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can someone tell me what biopace is?
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Old 08-26-07, 12:08 AM
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I ran BioPace on a couple of my fixies, and had no problems skidding or trackstanding or anything of the sort. I love 'em.

Sadly, I don't ride them any more because I built up a "classic" Bianchi geared bike for a buddy, and set it up with all Shimano 600 stuff (which included the BioPace rings on the Shimano 600 cranks.)
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Old 08-26-07, 07:54 AM
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Originally Posted by ryanlovesyou View Post
can someone tell me what biopace is?
Biopace
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Old 08-26-07, 08:02 AM
  #24  
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I have been running a biopace on my fixie for the last 5 months. Chain tension has never been an issue at all. It is a little harder to adjust the chain tension, but once you have it dialed in you are good to go. I prefer biopace, not sure why exactly, but I feel a lot more efficient on it.
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Old 08-26-07, 11:25 AM
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I've used them. No significant tension problems on either FG or SS. At least no more than on a regular round chainring (I have yet to come across a FG/SS setup that exhibits consistent chain tension without the use of some kind of tensioner). Never noticed any benefit, either. I suppose in theory, they're supposed to do something, but the effect was too subtle for me to notice. I suspect for most folks, too, otherwise, they'd still be popular.
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