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Are Bio-pace or similar chainrings advantageous for touring?
On Dec 5, 1:01*pm, Chalo wrote:
DirtRoadie wrote: I don't know the model designations nor dates of origin but my old parts repository contained a 28T steel BP ring and the aforementioned aluminum 26T. I don't believe the 26T is an "HP" version. The major axis is nearly identical between the two, while it is the 26T which has a minor axis that matches a 24T (~81mm) as you describe. The 28T is noticeably more round/oval (100/92mm) while the 26T at 98/82mm is also almost angular in appearance, somewhat like a parallelogram *with rounded corners. The overall roundness of the 28T ring counters my prior generalization that smaller BP rings are less round. There are obviously several flavors of BioPace. I guess that's true, but up until now I had only distinguished the original Biopace from Biopace HP, which was closer to round. *The original triples were 48-38-28 only, because the 28t and 38t rings could not be made smaller at that shape and still fit on a 110/74mm spider. I believe that the 26T ring I have was standard issue with a Deore XT crank circa 1988. The HP rings being rounder reminds me ..... Heck, no point in my re-writing it: http://groups.google.com/group/rec.b...a35d362e155a3f DR |
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