Thread: Biopace switch
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Old 12-20-10 | 01:08 AM
  #19  
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Kimmo
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Originally Posted by pauline22
"Although it features a 130mm bolt pattern, it should only be used with triple cranks because the tooth profiled and ramping are specifically designed to have this ring sandwiched between two other rings."

It seems everything I look at is for triples. Is this likely to be a problem?
Pffff.

Absolutely no drama. As Jeff Wills says, it just means there'll be unused shifting aids.

Although it does mean slightly less metal in some of the teeth, which by rights would lead to shorter life.

So you'd be paying a bit extra for fancy bits that won't be used and it won't last quite as long as a plain one.
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