On Thu, 2013-02-21 at 14:25 -0800, Mark R. wrote: > I had no issue with indexing and Campy above the bb cable guides. Not sure > why that would be an issue anyway.
Well, the issue (the only one I know about, the Campy above bb cable guides was a question, as they do it differently now) with the older tandems was that the cables ran through holes drilled in a flange below the front bottom bracket shell (the front bottom bracket shell on those tandems is split, clamping around a moveble eccentric bottom bracket shell within a shell) and there was too much friction where the cable passed through the hole, making rear index shifting unpredictable and inconsistent. It took a while to identify the source of the problem, too. I don't recall any other cases where older style frame design caused problems retrofitting indexing, and obviously, this issue is tandem-specific. Other than width, the only other obvious changes in frame design I can recall are that cable guide and rear derailleur hanger. Older AM-series Moultons had a rear derailleur mount that was said to be to SunTour rather than Shimano specifications, and some have claimed that difference causes trouble when converting those bikes to modern index shifting. My AM, an early 80s model, has the old style dropout/derailleur hanger, but with a modern derailleur and bar end shifter it indexes perfectly with 8 speed Hyperglide, so I'm not sure how much of an issue the derailleur hanger actually is in practice. The older frames had narrower rear triangle spacing, but that's not a potential indexing problem, it's a matter of getting a wider hub to fit in there. As Sheldon has pointed out, you could upgrade a 7-speed cassette hub to 8 speeds without spreading the triangle and fitting a 130 hub with the "8 of 9 on 7" method, and some have even tried "9 of 10 on 7". -- You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en. For more options, visit https://groups.google.com/groups/opt_out.
