OK, I've got a santa cruz chameleon, with 38 and 26 chainrings. I called up santa cruz, and asked them which mech would be best for the chameleon, and they told me to get this one.
http://www.woollyhatshop.com/view_product.php?id=1183
However, as you can see, it does not work. The picture shows how the actual metally bit is touching the frame, even though its in the outer ring. So when it comes down and in for the smaller ring, its just not going to happen.
I went down to my LBS and they were very helpful, and tried out this mech
http://www.woollyhatshop.com/view_product.php?id=2679
Which also did not work, for the same reason.
I've been recommended a dedicated double mech, such as sram double x, or shimano saint something something?
Will this work? And I already have shimano XT shifters, so would a sram mech work anyway?