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I'm replacing my X9 with an X0 rear mech.

Is it a simple unbolt old and bolt on new conversion? I'm guessing it is?

When bolting on a new deraillure, how do you set the angle at which you bolt it on?

It is very easy, worth watching a few you tube videos' especially for indexing the gears after.

I'm OK with indexing the gears, did it on my old bike with a Shimano Mech. Its more the angle at which the whol mech bolts on, ie, its a single bolt, hence it could be fitted 'rotated' and hanging in the wrong position prior to any indexing. Or, are their any guide marks on the hanger or frame that prevent it being installed incorrectly?

I guess it will all become clear when I do it tomorrow.....

Its pretty easy, the "B" screw is the only thing the adjusts the angle of the dangle.
if you can index the you'll be fine, one bolt on, one bolt off.

The mech (old and new) will have a small bit sticking out that locks against the mech hanger to guide you to getting it straight.

Ah ! Cool ! Easy as pie then.