Tandem Cycling - Ultegra 6603 Shifters + 11-32t = Which Rear Derailleur?
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02-13-12, 01:45 AM
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?
02-13-12, 08:40 AM
I think any XT 9 speed derailleur such as M770 would work.
02-13-12, 08:48 AM
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.
02-13-12, 09:58 PM
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."
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