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PostPosted: Thu Jun 07, 2007 1:21 pm 
Posh Mark
Posh Mark
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Joined: Wed Apr 18, 2007 2:49 pm
Posts: 5981
Location: As far from the city as you can be ....
Hi,

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?

Thanks,

Mark


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PostPosted: Thu Jun 07, 2007 2:05 pm 
Retro Guru
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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."


http://www.sheldonbrown.com/biopace.html


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PostPosted: Thu Jun 07, 2007 6:27 pm 
BoTM Winner / PoTM Winner
BoTM Winner / PoTM Winner
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Joined: Sat Jan 13, 2007 10:44 pm
Posts: 1184
Location: norcal
we were just talking about this
http://forums.mtbr.com/showthread.php?t=305187


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 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.


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