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Should I Ditch My BioPace Chainrings

Q:   I have an ’87 Peugeot with old Shimano BioPace chainrings. Low gear is 42×24-tooth. My buddies with triples are killing me on climbs! Should I ditch the BioPace and install 53/39-tooth rings? — Byron M.

COACH FRED:  Ditching BioPace chainrings is an excellent idea. That out-of-round design was an experiment that failed. No studies that I’m aware of showed any advantage, aconclusion that has been proved empirically because they’re no longer manufactured.

Switching to 53/39-tooth chainrings will give you a lower climbing gear, but you might also look into a wider-range set of cogs. I assume that your ’87 bike has a 7-speed freewheel. They’re still available. A 12-26-tooth freewheel would give you a 39×26 low gear. That should let you spin with your buddies on most climbs.

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Comments

  1. Norman says

    July 10, 2020 at 6:11 am

    It works for me, and there are studies, e.g. http://blog.artscyclery.com/general/shimanos-ill-fated-biopace-validated-in-university-study/

    Reply

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