The same shifter and derailer combination will never index on both Shimano 8 and Shimano 9. Shimano 8 has 4.8mm spacing between cogs. Shimano 9 has 4.34mm spacing between cogs. That specification written on your shifter means that the amount of cable pulled by each click is right to make an RD7700 move 4.34mm and that same amount of cable also happens to make an RD7400 move 4.8mm. The geometry of the derailer parallelogram on all 9-speed Shimano derailers was designed to be equivalent, so that for 9 speed, one model of shifter is supposed to index correctly with any 9-speed shimano rear derailer.
On Nov 17, 1:00 pm, Juhani <juhani.lait...@gmail.com> wrote: > Yes, it’s frustrating because I’ve only heard good things about this > combination, but for some reason I can’t get it right. > > My rear cassette has 9 cogs for sure. And even if it didn’t, my Dura > Ace shifters has written on them: “Compatible with RD-7700(9s) & > RD-7400(8s)”. So it should work even with 8-speed cassette, right? > > I haven’t taken the rear derailleur apart so the pulleys are in the > same place as it was mounted in the factory. It worked fine with the > Silver Shifters - except my problem with dialing in the biggest cogs > right. And now I can get some of the cogs working - like 3 largest or > 3 smallest - but not all of them at the same time. > > I haven’t torqued the mounting screw with a torque tool, so I’m not > sure, but I don’t think it’s over the 10Nm recommendation. I could try > to loosen it up a bit, if you think it could cause the problem. -- You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. To post to this group, send email to rbw-owners-bu...@googlegroups.com. To unsubscribe from this group, send email to rbw-owners-bunch+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en.
