Originally Posted by
Kimmo
Nothing, if you have a compatible shifter. Not the same actuation ratio as earlier derailers though, so not backwards compatible. Your bike isn't 9s.
I’m confused - or possibly you are confused ?
are you confusing shadow with rapid-rise (or something else) ?
the 772 shadow RD pull is 1.7 I believe - ? - same as other Shimano 9 speed
the bike pictured with the 772 RD is a 9 speed