I've just installed a Hope T-Rex on my 10sp setup. Indexing is fine, b-tension is good - the problem is the chainline. When back pedalling the chain drops two rings at the back.
The chain was a little noisy when pedalling normally, so I've popped in a very thin spacer behind the T-Rex, which resolves that - but the chain still drops when back pedalling a couple of gears.
My OneUpComponents 42t doesn't do this, it's absolutley fine back pedalling.
Anyone got any ideas? Or had this same problem? I am thinking of sticking a spacer on the BB to move the chain line - but I shouldn't need to.