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Dirt on the spindle/crank interface or bb cartridge/shell with dirty threads?
Or any of the above and associated bolts not torqued enough?
Do you have a quick link in the chain? A slightly bent link plate causes me weeks of WTFs.
miro_o-
This isn't a squeak, rattle or intermittent noise - it's a sustained grinding from the cog.
I can see the rollers pinging off the teeth and making a small noise if I do it slowly enough.
But I take your points on board.
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I do have a quick link in there, but all looks fine to me.
I have a spare chainset somewhere, so may throw that on, see if it solves it, if not, then bottom bracket... Another Sunday in the shed instead if riding.
NotThamesWater
SternsCycles
My chainline is making a noise near the sprocket like a dishwasher full of spanners.
The sprocket teeth (surly 1/8 17t) looked to be worn, with play between the rollers and the teeth.
The chain itself is pretty new, and I have replaced the sprocket.
And it's still ridiculously noisy.
It looks as though the chain roller catches on the tooth of the cog as it moves off - which would also explain the wear pattern on the old sprocket.
What am I doing wrong, internet?