Retrobike Forum Index

It is currently Mon Aug 19, 2019 4:08 am

* Login   * Register * Search  * FAQ

Post new topic Reply to topic  [ 4 posts ] 
Author Message
PostPosted: Thu Jun 07, 2007 1:21 pm 
Posh Mark
Posh Mark
User avatar

Joined: Wed Apr 18, 2007 2:49 pm
Posts: 6105
Location: As far from the city as you can be ....

Has anybody ever run a single speed bike with a shimano biopace front ring.

I cannot make up my mind if it would make any difference with it being elliptical (thinks back to maths at school)????

If it would make a slight difference would a sprung chain tensioner take up the slack?

One other…….

The singlespeed cassette jobbies are typically listed as being 8/9speed – does anyone run one on a 7 speed free hub?



 Post subject:
PostPosted: Thu Jun 07, 2007 2:05 pm 
Retro Guru
User avatar

Joined: Wed Jul 06, 2005 12:49 pm
Posts: 475
Location: Cairns, Australia
If you can use them on a fixed gear i'm sure they would work on a single speed. This is off the Sheldon Brown site...

"People are often astonished to learn that I ride Biopace chainrings on fixed-gear bikes. They imagine that there will be tremendous changes in chain tension as the chainring rotates. In practice, this is not the case. A 42 tooth chainring will generally engage 21 teeth against 21 chain rollers, regardless of its shape.

There is a slight variation in tension resulting from the varying angle between the two straight runs of chain as the axis of the chainring rotates, but this has not generally been of a sufficient magnitude to cause any problem in practice for me."

 Post subject:
PostPosted: Thu Jun 07, 2007 6:27 pm 
BoTM Winner / PoTM Winner
BoTM Winner / PoTM Winner
User avatar

Joined: Sat Jan 13, 2007 10:44 pm
Posts: 1192
Location: norcal
we were just talking about this

 Post subject: Biopace
PostPosted: Thu Jun 07, 2007 9:09 pm 
Dirt Disciple

Joined: Thu Apr 19, 2007 2:28 pm
Posts: 30
Location: Bracknell, UK
I use Biopace chainrings on both a fixed gear and on a hub gear bike (which obviously has a single rear cog) with no problems at all. The circumference is the same as a round chainring so it seems to make little or no difference to chain tension. Go for it.

Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 4 posts ] 

All times are UTC [ DST ]

Who is online

Users browsing this forum: Majestic-12 [Bot] and 10 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