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ak-
My caad12 also sounds like a bag of spanners but I’ve tracked it down - I think, to the internal cabling rattling within the thin tubing
-
If you’ve got a variation of the Si crank then yeah, it’s a possibility.
The lockring bolts down the spider or spider ring to the drive side crank.
It’s a pain to deal with because you need both the special tool - which I have - and a very solid bench vice - which I do not.
PhilDAS
Howard
My Habit was sounding like a bag of spanners so I dutifully replaced all the stock pivot bearings - that have a terrible reputation for being shite and falling to bits - with Enduro Max.
Turned out it was the lock-ring on the Si crank loosening itself. Ho hum.