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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
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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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