Having a bit of grief getting my rear mech to index properly, it's an XTR clutch mech on a 3x10 setup on a new-ish bike.
Have followed my usual favourite instructions, from the Park Tools website, and it seems to be set up just fine when moving up the block, i.e. from the smallest sprocket to the largest.
Shifts quickly and quietly and doesn't miss any gears.
However, shifting in the other direction, from largest to smallest, the same is not the case. It will miss the odd shifter input and then either shift 2 on the next change or randomly catch up on that missing shift all by itself. And be a bit rattly in between.
Any ideas ?