Can I use a Shimano Biopace (Eliptical chain ring) on a single speed/fixie?
07-24-08, 07:06 PM
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Can I use a Shimano Biopace (Eliptical chain ring) on a single speed/fixie?
The title says it all. I have an old Shimano crankset with Biopace chainrings. I plan to
use the 42T ring, but it is elipitcal. I am not putting any tensioner or what not, just
a crankset and a cog. I doubt it will work. am I right or wrong?
use the 42T ring, but it is elipitcal. I am not putting any tensioner or what not, just
a crankset and a cog. I doubt it will work. am I right or wrong?
07-24-08, 07:07 PM
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You are wrong. It will work.
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07-24-08, 07:12 PM
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07-24-08, 07:17 PM
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from sheldon:
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.
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.
07-24-08, 07:17 PM
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I ran a biopace on my conversion for about a year (~1000 mi or so). I didn't have the straightest chainline (road cranks) and I only threw the chain once going downhill on an already slack-ish chain. If it's setup properly, it should be fine.
07-24-08, 07:20 PM
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Since I'm getting rid of the big ring, where can I get the chainbolts with the correct stack height?
Can I use some home-depot washers?
Can I use some home-depot washers?
