Currently running sgs (long cage) slx rear derailleur but looking at a clutch mech for my 2×10 with 11-36 cassette and
26-38 chainring. Would a medium cage be ok ?

Ive just bought a SRAM X9 medium for my 2×10 set up.

You SRAM or shimano?

Full shimano slx group set but was looking at the xt clutch mech

24/38 with an 11-34 and running a GS (medium) SLX mech here.

A medium will be ok for a 2×10, just make sure the mech will go up to a 36 on the cassette.

I have read it won’t work with my gear ratio don’t know why !

Chain length…it’ll either be too long or too short so either extreme is unlikely to work…

Running 11-36 and 24/38 with GS medium SLX clutch mech and no issues here.

No probs for me with that gear set up and a gs mech. Get the full spread off the 38.

Cheers chaps a gs clutch mech it is

No problems with my 2X10 on the medium cage XT plus. Just make sure the chain length is setup correctly.

I forget the numbers but the medium mech capacity is two links under what you’ll have with the 36/38, that said I am runnning the same setup and just made sure I allowed two links in big/big when fitting the chain.

11-32 Cassette & 38-24 Chainring = Rear Mech with 35T capacity.

11-32 Cassette & 38-26 Chainring = Rear Mech with 33T capacity.

11-32 Cassette & 40-28 Chainring = Rear Mech with 33T capacity.

11-34 Cassette & 38-24 Chainring = Rear Mech with 37T capacity.

11-34 Cassette & 38-26 Chainring = Rear Mech with 35T capacity.

11-34 Cassette & 40-28 Chainring = Rear Mech with 35T capacity.

11-36 Cassette & 38-24 Chainring = Rear Mech with 39T capacity.

11-36 Cassette & 38-26 Chainring = Rear Mech with 37T capacity.

11-36 Cassette & 40-28 Chainring = Rear Mech with 37T capacity.

On full suss you may also need to allow for chain length growth through the suspension stroke. Or not depending on the design.