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I was also experiencing the "metal scraping" sound on my 9.9s rear hub. I also didn't enjoy the random freewheel buzzing. I replaced my 9.9S rear hub with the Onyx hub. It is completely silent now. The part on the invoice is: 103802 MFU REAR MTB CL MS - 142/12mm thru (BLACK) I just called Onyx...

Thanks @KurtEDH - do you have the specific Deore XT Hub part # that your shop ordered. I want to make sure I can get my shop to order exactly what you got. Thanks!

@KurtEDH When you say "it is quiet so far" do you also mean the pawls "buzzing bees" sound is no longer there in addition to the intermittent scratching sound?

@ppilarski I have had the creaking sound you mentioned so much that my 9.9S spent many days at my local Trek shop for diagnosis and repair. They singled out the back fender connection to the frame. There are two stays on each side that have a channel that keeps the fender in place (see...