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Old 04-30-08, 06:02 PM   #1
wayne pattee
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Chainring shape

The 52 tooth chain ring is a little bit out of round. There isn't any bind in the chainring bolts but its off a little. Is that ok or should I replace it?
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Old 04-30-08, 06:51 PM   #2
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Was it made that way? There are some oval chainrings, like the Shimano Biopace.
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Old 04-30-08, 07:00 PM   #3
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Out of round as in "up and down" or "side to side?" I assume you mean it's a bit oval. I don't see how that could happen unless it is in fact a Biopace like Sweetlou says.
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Old 04-30-08, 07:40 PM   #4
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If it's not Biopace maybe the bottom bracket spindle is bent?
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Old 04-30-08, 08:03 PM   #5
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Yes it is a biopace. They are made that way huh?
OK I feel better now
Thanks for the info
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Old 04-30-08, 08:36 PM   #6
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There are others besides Biopace. Biopace is the most common one seen though.
Read up on them: http://www.sheldonbrown.com/biopace.html
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Old 04-30-08, 08:49 PM   #7
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Used to have a Sugino Cycloid ring.
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Old 05-01-08, 06:10 AM   #8
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should have known to search Sheldon's site.
I have much to learn and many dumb questions to be answered.
Thanks again
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