Will Dyna-Sys Rear Derailleur and Cassette Work With 6700 or 7900 Shifter?
Answer via Lennard Zinn and Shimano on Singletrack.com.
(Editor’s Note: This is a revised answer to Dale’s question.) No. The cable pull is different. As Shimano Multi Service Technical Representative Nick Murdick puts it, “The Dyna-Sys rear derailleur uses a different cable-pull ratio then anything else we make as well, road or mountain, so it can only be used with a Dyna-Sys shifter.
“I imagine people will try to match the Dyna-Sys cassette with 9-speed mountain rear derailleurs, which do use similar cable pull ratios but they are not exactly the same so there will be some drop off in shifting performance.
“The change in cable pull ratio for the Dyna-Sys system comes from the evolution of the modern mountain bike. When we designed the previous standard for cable pull people were riding steel hard tails. Now, with full-length housing, moving suspension pivots and people riding in harsher conditions then ever, the whole system needed to evolve as well. The shifter now has more leverage to pull a contaminated cable around corners and through dirty housing. It is also better matched to the rear derailleur so the light effort to pull cable and get to the next bigger gear is more consistent across the cassette.”
That said, the older XT / XTR rear derailleurs should work OK. It’s better to use the narrower upper pulley with Shimano’s “center-on” side play from a Shimano 10-speed road rear derailleur (7800/7900) than the 9-speed MTB upper pulley. The cable stroke on a Shimano 9-speed MTB rear derailleur is technically not a perfect match to Shimano road STI levers because the MTB cable stroke was designed to work for both High- and Low-Normal rear derailleurs. But for 9-speed conversion, it is an acceptable conversion, and it should be for 10-speed as well with that jockey wheel change.
- Lennard
Dear Lennard,Dear Dale,
Will the new Shimano 10 speed “Dyna-Sys” XT cassette (11-32, 11-34) and XT rear derailleur work with Shimano Ultegra 6700 and Dura Ace 7900 road shift levers?
- Dale
(Editor’s Note: This is a revised answer to Dale’s question.) No. The cable pull is different. As Shimano Multi Service Technical Representative Nick Murdick puts it, “The Dyna-Sys rear derailleur uses a different cable-pull ratio then anything else we make as well, road or mountain, so it can only be used with a Dyna-Sys shifter.
“I imagine people will try to match the Dyna-Sys cassette with 9-speed mountain rear derailleurs, which do use similar cable pull ratios but they are not exactly the same so there will be some drop off in shifting performance.
“The change in cable pull ratio for the Dyna-Sys system comes from the evolution of the modern mountain bike. When we designed the previous standard for cable pull people were riding steel hard tails. Now, with full-length housing, moving suspension pivots and people riding in harsher conditions then ever, the whole system needed to evolve as well. The shifter now has more leverage to pull a contaminated cable around corners and through dirty housing. It is also better matched to the rear derailleur so the light effort to pull cable and get to the next bigger gear is more consistent across the cassette.”
That said, the older XT / XTR rear derailleurs should work OK. It’s better to use the narrower upper pulley with Shimano’s “center-on” side play from a Shimano 10-speed road rear derailleur (7800/7900) than the 9-speed MTB upper pulley. The cable stroke on a Shimano 9-speed MTB rear derailleur is technically not a perfect match to Shimano road STI levers because the MTB cable stroke was designed to work for both High- and Low-Normal rear derailleurs. But for 9-speed conversion, it is an acceptable conversion, and it should be for 10-speed as well with that jockey wheel change.
- Lennard
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