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Bio-pace Question..........

Old 01-01-08, 10:21 PM
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Thumpic 
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Bio-pace Question..........

I read the Sheldon Brown article and the threads I could find, but I still have a question. I got a beater Giant mtb from the thrift store. It's at least 16 years old. ('92 U of M sticker on it)...anyway I thought the crank and/or chain ring was bent. After FINALLY realizing it was made that way, I think it's fine....but is there supposed to be any variation in the teeth of the rings, or just the shape? The rings are the correct shape; but they still may be worn out....comments? Thanks in advance............
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Old 01-01-08, 10:27 PM
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If you're referring to some teeth being shorter than the others, it's normal, it helps with shifting-
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Old 01-01-08, 10:29 PM
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Would they be in clusters or alternating...random?? I don't see any teeth broken or scarred........
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Old 01-01-08, 10:57 PM
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They're positioned to work in conjuction with ramps and pins to make shifting smoother and more responsive. It will vary some from chainring to chainring, but no, they're not in clusters, at least I've never noticed they are. They might appear to be randomly positioned, but they're not; again, they work along with the ramps and pins. If you could post a pic, it would be very helpful.

The teeth on worn out chainrings generally have a "shark fin" look, with the teeth being much sharper and more pointed than they were originally-

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Old 01-02-08, 01:09 AM
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Biopace rings are not round, they are a weird oblong shape. They are easily identified usually. If you can supply a pic, I'm sure we can figure out what's going on.
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