Have been fighting the IRD 11-32 10-speed cassette on my '08 Cannondale RT2. That cassette does not shift well at all, as noted in many other threads.
Thought about installing a JTech 10-to-9 speed converter, as mentioned here, but it does not look like it will work with the Shadow RD. The converter is a 90-degree set-up, whereas the ne shadows have the housing feed into the RD straight, like SRAM.
#1. Bought a Ultegra 6600 12-27 cassette, but that just doesn't have low enough gears for many of the mountains by our house. The bike did shift excellent with this cassette, but I just need lower gears.
#2. Bought a new '08 XT Shadow RD because it is supposed to have a stiffer spring and I though maybe that would help with the IRD shifting. With the IRD cassette, it still shifted like crap. The original RD was a triple Ultegra.
#3. Just ordered a new set of STI 6510 9-speed triple shifters, an XT 11-34 9-speed cassette, and 9-speed chain. I'll use the Shadow XT RD.
I realize there will be larger spreads in the shifting, but that is not a concern at this point. I want to take the tandem on the Blue Ridge Parkway and Assault on Mt Marion and I need the lower gears.
The 10-speed tandem gear might migrate over to my road bike and convert my 105 9-speed Roubaix to Ultegra 10-speed. Although the 9-speed 105 works very well.
I am assuming that the 9-speed chain will work fine with the 10-speed Truvativ Elita chainrings & Ultega FD.
Anyone see glaring compatability issues before I start parting-out the bikes?
Thanks for the double-check,