Tandem Cycling - Ultegra 6603 Shifters + 11-32t = Which Rear Derailleur?

Well, I have done many researches for upgrading. I bought 6603 10spd Shifters, Sram 10spd cassette, 10 spd chain. However it doesn't work with 10spd XT M780 Rear Derailleur.

With proper wire cable installation; I still couldn't shift the RD to last two biggest teeth sprockets. I have searched couple post and people said Ultegra 6603 doesn't work with any RD with Dyna Sys...

Do you guys have any solution :D?

Thanks!

I think any XT 9 speed derailleur such as M770 would work.

Yeah, 10 spd mtb derailleurs (dyna sys) don't play nice with anything not dyna sys. Don't know why they'd do it that way, but you'll need 9 speed rd's to work with road components.

From a Thread I started a couple weeks ago.

I asked a local tandem shop and this is what they sent me.

I think it works for 6603 as well.

I just ordered XTR 9 speed and 6703.

"Sorry for the delay, but I wanted to check for opinions with our suppliers and Co-Motion Cycles, who use the Ultegra shifters on many tandems. They use the 6703 model, which is the one currently supplied, with the 9-speed XT rear derailleur (M772). The overall width of the 10-speed cassette is the same as the 9-speed, and the M772 actually has a greater chain take-up than the newer 10-speed one. The reason for this is that Shimano designed the new 10-speed drivetrains to use only 2 chainrings, so there is not as much chain length change as with 3 chainrings, especially when tandems often use such a wide range of gears.

Hope this helps.

We can get you the levers, cassette, rear derailleur and chain if you wish. The levers list at $670, but we will sell them for $569. The XT rear derailleur lists for $161, but for you, $131, giving a total of $700 plus tax. If you wish to add a chain, they run from $45 to $75, and cassettes can be had from $50 (Tiagra 12-30) to $70 (Deore) $94 (SLX) to $125 (XT). The mountain 10-speed cassettes all start with 11 teeth."