should do but you'd need the rear cassette, mechs, chain, shifters and a 9 speed compatible chainset. Would probably be easier and cheaper to keep 8 out back but its your call I guess
the cranks and chainrings. basically, to get the extra cog at the back the chain has been made narrower and therefore the chainrings at the front have narrower teeth (I assume anyway).
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Have a look through here, don't think sram make chainsets
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