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My Middleburns creaked incessantly. I'd remove all bolts, clean and regrease everything, put it back together and it'd be quiet for 5 minutes then it'd start again. Not really a fan of that pre-load collar system either.
I switched to Shimano XT. Proprietary BCD is a bit of a pain but Shimano narrow wide chainrings are readily available from 30-34t, and reasonably priced. New(er) SLX look good too.
Jon.
I've never been overly impressed by my last set of middleburns, with the external BB. Had them come loose too many times.