want to change a long cage rear mech for a medium XT ( or short not sure which it is ? )
will i need to shorten the chain ??
there are also the numbers MAX 32 / TOTAL 33
what do they refer to ??
am running it with an LX microdrive
and an 11 - 28 sprocket , are they compatible ??
The MAX 32/ TOTAL 33 refers to max 32 tooth sprocket and 33 total difference.
I.e. 11-32 on the back = 21 difference
22,32,44 up front = 12 difference, so total 33 is ok so long as you are using this on a hardtail.
On full suss. add another couple of teeth to the above to allow for chain growth so not adviseable unless using 12-32 rear or 22,32,42 up front.
With your 11-28 you should be fine up to a 20,32,46 if desired.