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Old 07-07-13, 11:33 AM   #1
Jseis 
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Elliptical at pro level

http://cycletechreview.com/2012/news...our-de-france/

http://www.noncircularchainring.be/


And a Sheldon Brown link

http://sheldonbrown.com/biopace.html

If it does translate to an increase in effective application of aerobic power, then it makes sense that Froome would use it and his cadence and pedaling style are likely optimized for that effectiveness and in particular on steady state climbs.
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Old 07-07-13, 04:36 PM   #2
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Sheldon Brown's article is way out of date. Biopace failed in the market, and as far as I know no data supported its alleged benefits. (FWIW I briefly used Biopace chainrings, and did not find it beneficial in any way.)

From what I can tell, the science is unclear. Some studies indicate there is no benefit, some claim a small benefit (2%). I don't know of any evidence that it's detrimental, either.

Until there's solid evidence of the benefits, I for one remain skeptical.
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Old 07-07-13, 05:27 PM   #3
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Rotor is a whole different shape than Biopace, if Froome likes it ,he makes it look like it makes a difference.

Talented trained professional Racers are paid to make the gear they ride look like it is why they win.

by those who make the parts ..

only by having them repeat the same situation* with different stuff on their bike
can any implications be drawn.

*like not being caught in a crash, not getting a puncture.. etc.
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Old 07-08-13, 12:00 AM   #4
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Quote:
Originally Posted by Bacciagalupe View Post
Sheldon Brown's article is way out of date. Biopace failed in the market, and as far as I know no data supported its alleged benefits. (FWIW I briefly used Biopace chainrings, and did not find it beneficial in any way.)

From what I can tell, the science is unclear. Some studies indicate there is no benefit, some claim a small benefit (2%). I don't know of any evidence that it's detrimental, either.

Until there's solid evidence of the benefits, I for one remain skeptical.
If there was hard evidence of a 2% benefit (ie, 48 seconds on a 40 minute climb), then the whole peloton would be on them.

I have a biopace ring on my single speed (sounds counterintuitive, but it's only ever pulling the same length of chain) and I've never noticed a difference in performance or feel either way.
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Old 07-08-13, 12:08 AM   #5
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I noticed a riding partner losing chains every time he went to the big ring on a downhill with biopace rings. He couldn't give the things away after some of that.

Last edited by Zinger; 07-08-13 at 02:24 AM.
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Old 07-15-13, 02:07 PM   #6
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Christie O'Hara did a research paper while at Cal State San Luis Obispo. The paper was on Rotor and tri athletes. I can't find it online but might have saved it on PDF.

Google her name and perhaps you can find stuff on Rotor's elliptical rings.
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Old 07-16-13, 09:40 AM   #7
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From the google:
http://roadcyclinguk.com/gear/the-sp...tie-ohara.html
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