Cassette, Chain, Derailer compatible?

boiler790
boiler790 Posts: 42
edited July 2010 in MTB workshop & tech
Hi

I just replaced my chain (KMC X9L) on my 2010 Spesh R/hopper Expert and it's slipping on the smallest 2 cogs of the cassette (Shimano HG50).

Thought I could get away without replacing the cassette but it appears not.

Is an SRAM PG970 compatible with what I've got above & Shimano XT shaddow derailer.

ta

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