Thread: Wonky/Oval Chainring - is this a problem?
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Old 05-09-11 | 06:53 AM
  #16  
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Kimmo
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From: Melbourne, Oz

Bikes: https://weightweenies.starbike.com/forum/viewtopic.php?f=10&t=152015&p=1404231

I came across a study linked in an earlier thread; went right into the whole deal. Rings need to be seriously wonky before being good for an extra 6-7% max. Biopace rings were in the range of around 1% when rotated IIRC (earlier ones were less round and good for a tad more). That ring is Sugino thus not Biopace.

Sadly, couldn't find the article the next time these came up... : (
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