On 08/26/2016 01:19 AM, Tim Butterfield wrote:
Thanks, all, for the replies.
I think part of the issue was the Dura Ace 7900 down tube shifters are
indexed and that road indexing did not match the mountain rear
derailleur. If there as an indexing failure, I couldn't fall back to
friction.
Really, these days that's not what you need to worry about. Indexing
failures that you need to switch to friction to work around are rare as
hens teeth today. What's not rare with indexed integrated brake-shift
levers (see, I didn't say "brifters") is cable fraying and breakage
inside the STI unit. That happens a lot with STI. It almost never
happens with downtube shifters, and if there was cable fraying going on
with downtube shifters it's all right there out in the open where you
can see it (rather than hidden inside the bowels of the unit, where you
cannot) and deal with it when the first strand breaks, rather than
discovering it only after the cable has completely broken.
It is possible that the Wolftooth TanPan might induce cable fraying.
It's very similar to the Travel Agent devices that make V brakes
compatible with road brake levers, so perhaps someone with experience
with that device can speak to this. I have a friend who has used V
brakes with STI on her Seven touring bike for must be 10 years now or
more, and she's never mentioned a problem, so absent reports to the
contrary I assume it's OK.
I read through this article from that discussed a lot of these
issues. It is from last November, so not too far out of date.
http://www.cyclingabout.com/wider-gear-range-road-shifters-gears-for-easier-hill-climbing/
<http://www.cyclingabout.com/wider-gear-range-road-shifters-gears-for-easier-hill-climbing/>
That article linked to this resource:
http://www.cyclingabout.com/gear-ratios-how-to-select-touring-bike-gearing/
I could try to have Brian get something working, but it might end up
being a hack that didn't work
It's all a hack -- in a good way. You are meant to be using narrow
range racing gearing and if it doesn't work for you you're not supposed
to be riding and tough darts to you. Anything else is a hack. Get used
to it. :-)
and may require more than one attempt. I'm not sure it is worth it at
this point when there is a known good recommended solution that has
been in successful long term use.
It's not quite the dream I originally had, but I emailed Brian to go
ahead with the 3x9 and bar ends. It will give me a gear range of
about 19 - 122 inches. If it proves too problematic for me to adjust
to, I can always change it later. Or, if it turns out I really can't
stand it not living up to my expectations, it will be a standard Riv
setup for easier sale. I can't really imagine that happening,
though. It might turn out to fit well with my retro-tech setup,
9-speed with radar tail light and bike computer. :)
What is your use case for a 122 inch high gear?
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