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Hi
I have a kona kikapu, 9 speed with Deore LX shifters. Currently I have a long cage Shimano Deore rear mech
Will an XT medium cage rear mech (m771) be a straight swap
Details say ....
Deore XT rear derailleur delivers reliable and precise shifting with a stiff and lightweight open design
All-alloy construction leads to lower weight without compromising strength and durability
Four fluorine-coated link pin bushings make this one of the slickest shifting derailleurs on the trails
High rigidity wide outer link braces the pulley body to increase pivot joint rigidity
Mega9 compatible for use with 9-speed drivetrains
Durable sealed bearing tension pulley for low friction and smooth running of the drivetrain
Top normal spring uses the spring to select higher gears, best suited to use with Rapidfire shifters
Can be combined with Dual Control levers
Rubber bumper reduces noise when used on non-conventional frame designs
Weight: 239 grams SGS
You will need a long cage if running a front triple.
What about a rapid rise?
shimano offer three cage lengths, SS, GS and SGS, for the purposes of mountain bikes you are basically limited to GS and SGS. It is related to the gear range. IF you think about it you need enough chain to go round the big ring/big sprocket choice and then need the the rear mech to be able to accommodate all the chain you will have when in the small sprocket/small chainring gear.
To answer your question, if you are running a double chainset you do not need an SGS. If you are running a triple you may not need a SGS, depends a little on the gears you have , chainring and cassette.
For a straight swap you would be looking at an SGS, but you don't need an SGS and would find a GS rear mech will be fine, you may need to be careful on the extreme gears, which you shouldn't be using anyway.
just noticed that the details you give say SGS and the initial question mentions medium cage, that is GS???
Pass, seen it on eBay For 42 quid
Says Medium cage in title and then lists thy blurb above in the details
Thank you for the details on the different types of mechs
Can I use a rapid rise rear mech with my shifters?