Retrobike Forum Index

It is currently Sun Dec 04, 2016 3:22 am

* Login   * Register * Search  * FAQ



Post new topic Reply to topic  [ 5 posts ] 
Author Message
PostPosted: Tue May 29, 2012 4:15 am 
Dirt Disciple

Joined: Fri Mar 16, 2012 8:45 pm
Posts: 40
Location: Engloid
How do all,

I've just recently aquired a lovely Peugeot Grand Prix 501 from a fellow forum member and am trying to find out a little about the Biorythm chain rings. They're o-symetrical for those that don't know, but that's about all the info I have!

I'm yet to find any further info using the search feature and Google.

Does anyone know anything about these rings? I've been riding them for 2 weeks now putting I'd say between 10 and 15 miles per day and to be honest I can't tell the difference between them and standard rings...



Image


Top
 Profile  
 
 Post subject:
PostPosted: Tue May 29, 2012 9:22 am 
Dirt Disciple
User avatar

Joined: Tue Oct 11, 2011 8:19 pm
Posts: 93
Location: Rotterdam
I´d imagine it´s a licensed Biopace chainring. Sheldon Brown has a good article on its virtues: http://sheldonbrown.com/biopace.html


Top
 Profile  
 
 Post subject:
PostPosted: Tue May 29, 2012 11:22 am 
Retro Guru
User avatar

Joined: Wed Apr 25, 2012 2:08 pm
Posts: 2185
Location: Shrewsbury
Shimano had the similar Biopace rings, as I remember the idea was that that oval ring and the way it was positioned in relation to the crank arm meant that you generated more force on the down stroke and it was supposed to help up hills.

The theory, physics and mathematics all sounded good, in practice I don't think anyone noticed any difference.


Top
 Profile  
 
 Post subject:
PostPosted: Tue May 29, 2012 11:24 am 
Retro Guru

Joined: Wed Dec 10, 2008 9:19 am
Posts: 2093
Location: Sheffield, top city
something similar is in use in the pro peloton today. Wiggo uses something like that, not sure of the brand name.


Top
 Profile  
 
 Post subject:
PostPosted: Tue May 29, 2012 3:02 pm 
Newbie

Joined: Tue May 29, 2012 2:46 pm
Posts: 6
I´d imagine it´s a licensed Biopace chainring.Image


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 5 posts ] 

All times are UTC [ DST ]


Who is online

Users browsing this forum: No registered users and 16 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  

About Us

Follow Retrobike

Other cool stuff

All content © 2005-2015 Retrobike unless otherwise stated.
Cookies Policy.
bikedeals - the best bike deals in one place
FatCOGS - Fat Chance Owner's Group

Powered by phpBB® Forum Software © phpBB Group