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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 07-24-08, 07:06 PM   #1
skinnyboy
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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?
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Old 07-24-08, 07:07 PM   #2
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You are wrong. It will work.
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Old 07-24-08, 07:12 PM   #3
skinnyboy
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really? how come? The chain wouldn't get some slack in some positions?

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You are wrong. It will work.
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Old 07-24-08, 07:15 PM   #4
matt wisconsin
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sheldon did it.

for the affordability of a new ring, I'd just get a new one.....
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Old 07-24-08, 07:17 PM   #5
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from sheldon:

Quote:
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.
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Old 07-24-08, 07:17 PM   #6
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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.
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Old 07-24-08, 07:20 PM   #7
skinnyboy
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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?
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Old 07-24-08, 07:22 PM   #8
matt wisconsin
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your lbs or benscycle.net

IMO, don't skimp on the bolts.. the cheap alloy bolts tend to snap.
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Old 07-24-08, 07:25 PM   #9
skinnyboy
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those single speed bolts will work with my crankarm and chainring?

Last edited by skinnyboy; 07-24-08 at 07:33 PM.
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Old 07-24-08, 08:43 PM   #10
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1 ring+crank=single speed bolts, yes.
$12 for steel suginos at bens.
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