Took me ages to figure out it was the clamp. I replaced the BB (SKF stainless steel), removed & re-greased all the pivot rearings (8), removed and loc-tighted the chain ring bolts, then replaced my entire set of rings, chain & cassette
. Bloody did the full monty and it was still creaking. $%#&^!! Finally narrowed it down to the seat post, so replaced the clamp at the bottom, cleaned the rails and clamps at the top - then viola!! The quietest full suspension on the planet, for a week 

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