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Bad rear derailleur???



 
 
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  #21  
Old August 13th 19, 06:21 PM posted to rec.bicycles.tech
AMuzi
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Posts: 10,625
Default Bad rear derailleur???

On 8/13/2019 11:19 AM, Ted Heise wrote:
On Tue, 13 Aug 2019 10:18:41 -0500,
AMuzi wrote:
On 8/13/2019 9:47 AM, Ted Heise wrote:
On Sun, 11 Aug 2019 19:09:21 -0700 (PDT),
Chalo wrote:
Note that Shimano road and MTB 10 speed derailleurs have
different pull ratios. Rear derailleurs and shifters are
miscible up to 9 speed.

This might be why I could never get really good shifting on my
tandem, which came with 10-speed Shimano brifters and mountain
bike (XTR?) rear derailer. I could adjust it to shift well
across only part of the cassette. I swapped the rear der for
the newish long throw road derailer, and it now shifts
beautifully.


Santana builds with Ultegra STi and XTR rears and has for many
years (9, 10, 11 speed format); excellent dependable setup for
wide range gearing:

http://www.yellowjersey.org/sanes19b.html


I got my tandem through one of their larger distributors, and it
had a 36-tooth large cog--so it's possible the mountain rear
derailer was not Santana orginal. It's possible that Jack (at
Tandem's Limited) might have built it up himself.


36t was Santana factory gearing for a few years until the
new 42t low gear.

--
Andrew Muzi
www.yellowjersey.org/
Open every day since 1 April, 1971


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  #22  
Old August 13th 19, 07:57 PM posted to rec.bicycles.tech
Joerg[_2_]
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Posts: 5,799
Default Bad rear derailleur???

On 2019-08-13 07:47, Ted Heise wrote:
On Sun, 11 Aug 2019 19:09:21 -0700 (PDT),
Chalo wrote:
Note that Shimano road and MTB 10 speed derailleurs have
different pull ratios. Rear derailleurs and shifters are
miscible up to 9 speed.


This might be why I could never get really good shifting on my
tandem, which came with 10-speed Shimano brifters and mountain
bike (XTR?) rear derailer. I could adjust it to shift well across
only part of the cassette. I swapped the rear der for the newish
long throw road derailer, and it now shifts beautifully.


You can (or at least could) also get tiny pulley-things that act as a
cable pull ratio translator, like a mini "transmission" for the cable.

--
Regards, Joerg

http://www.analogconsultants.com/
 




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