On 08/26/2016 04:02 PM, René Sterental wrote:
Steve,
Thanks for enlightening me. I had done all my 10 speed conversions
with either the XT 9 speed rear derailleur or the road Sun XCD.
As everyone else pointed out really well, 10 speeds with either
downtube or barend shifters works very well provided you stick to a
road 10 or MTB 9 speed rear derailleur.
I guess I as lucky I didn't have a dynasys rear derailleur.
Shimano claims they made the change in cable pull on those dynasys rear
derailleurs to improve shifting, not to counfound those of us who have
been using their MTB rear derailleurs to handle larger sprockets on road
bikes. It just happens to work out that way.
That's not the only incompatibility found on "modern" bikes to stand in
the way of lowering gearing. A friend in the local club put a brand new
2015 (leftover) Specialized Ruby for sale because the low gear wasn't
low enough and two shops told her it couldn't be changed. Points of
incompatibility:
- BB30 bottom bracket limits choice of cranksets
- Front derailleur mounts on a tab on the seat tube whose slot is set so
that at the correct height for a 50T chain ring the derailleur is as low
as it will go. Lots of room to go up for larger chain rings (you could
easily fit a 56T on there) but nowhere to go down
- 11 speed derailleurs have different cable pull from both 10 and
earlier rear derailleurs, and also different from Dynasys MTB
- long cage road 11 speed rear derailleur designed for 32T largest rear
sprocket
- Wolf Tooth Road Link derailleur hanger extension will reposition an 11
spd rear derailleur to clear a 40T sprocket (on the XTR M9000 11-40
cassette) but that exceeds the capacity of the rear derailleur, won't
work with 16T difference in chain rings, but will work fine with less
difference but you can't move the rear derailleur down to fit a smaller
big ring thanks to the front derailleur mounting slot noted above, and
what would be the point of a larger small chainring if the point of the
exercise was to lower the low gear?
- and some of the latest 11 spd MTB rear derailleurs don't mount on a
derailleur hanger at all, and so are entirely incompatible with "our"
style frames. "Direct mount," they're called. They're about
thru-axles. Just one more thing to steer clear of if you're trying to
find your way to lower gears in spite of The System.
http://www.pinkbike.com/news/Shimano-Officially-Introduces-Direct-Mount-Rear-Derailleurs.html
It was a lot like being trapped in a maze, with no way out. But then we
learned about the TanPan, which adapts an 11spd Dynasys MTB rear
derailleurs to 11 speed brifters -- and those Dynasys MTB rear
derailleurs will handle that 11-40 cassette natively, no need to
reposition the derailleur, play with longer B screws, or anything else.
And during the course of this bug hunt, I discovered that it is possible
now to adapt DI2 to handle those 11-40 cassettes as well, with a MTB DI2
rear derailleur. Not that such gear would be of much interest to
members of this discussion group; but it does demonstrate that we are
not the only ones in search of gearing down to the low 20s for our road
bikes (the woman with this setup is well known on the Randon list).
Tim, you'll do great with 9 or 10. And, if you like the barend
shifters but don't like their position, there's always the stem
adapter to put them there. I have that setup on my Betty and love it
as well.
https://flic.kr/p/dKDmnB
https://flic.kr/p/e2CSkU
René
On Friday, August 26, 2016, Joe Bernard <[email protected]
<mailto:[email protected]>> wrote:
Steve: This is definitely the issue for me. High bars and short
arms make dt shifters just about useless. And the only time I have
"hit the knee" problems with bar-ends is on pullback bars like
Albas..they're fine on drops.
--
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]
<javascript:;>.
To post to this group, send email to
[email protected] <javascript:;>.
Visit this group at
https://groups.google.com/group/rbw-owners-bunch
<https://groups.google.com/group/rbw-owners-bunch>.
For more options, visit https://groups.google.com/d/optout
<https://groups.google.com/d/optout>.
--
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]
<mailto:[email protected]>.
To post to this group, send email to [email protected]
<mailto:[email protected]>.
Visit this group at https://groups.google.com/group/rbw-owners-bunch.
For more options, visit https://groups.google.com/d/optout.
--
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 https://groups.google.com/group/rbw-owners-bunch.
For more options, visit https://groups.google.com/d/optout.
