Tandem use of Shimano XTR M980 Rear Derailleur 10 SPD SGS model.
I am new to this site.
I recently purchased a used tandem and need to update for more hilly use.
The Litespeed tandem has a Wound Up X-2 Front Fork. Tandem used for about 2,000 miles. Avid disk brakes.
Old rear 10 speed cluster, came with the bike, 11-25 gears.
Ultegra Rear Derailleur came with the bike
I now have a Deore XT CS-M771-10 11-34 gear on the rear.
I need to change for the larger size rear gears.
Can I change to a 10 speed XT-M772 SGS Rear Derailleur for an
Shimano XTR M980 Rear Derailleur 10 SPD SGS model.
Can I use a Shimano XTR CN-M980 10 Speed Chain to replace
Shimano CN-HG94 MTB 10 Speed Chain?
Can I switch between the two chains??
One cost more, should that be better?
Will I need a longer length chain or to ad links to the chain for the larger 34 model?
These are to be used on my tandem with Ultegra .STI.
10 speed Shifters with Flight Deck feature.
I co not want to change from these .STI. brake/shifers.
I want to know what will work and advantages of the different options.
Spec' Tarmac (road), Ridley Fenix (commuter & fast tourer), Salsa Mamasita (MTB), CoMo Speedster (tandem), Surly Big Dummy (cargo), Airnimal (folder)
Yes, you'll need to get a longer chain. Any 10-speed chain should work. The new Shimano 10-speed MTB chains should be optimized to work with the new cassette, and should also work well with whatever chainrings you have. Any other 10-speed chain should also work reasonably well, though.
As said above, stay away from the DynaSys / 10-speed MTB rear derailleurs, stick with something labeled as 9-speed.