Potential whine from rear wheel

[mojoguzzi]

UPDATE (a bit): Changed the final drive oil--no bits, no bright metal flakes, just normal sludge at 4K on that oil. Will ride it tomorrow (things got in the way). Have an action camera mounted near the FD. We shall see.

I guess you didn't measure it? Chances are if there were no signs of leak then it would likely have still had the 180 ml of gear oil.

I did, actually--and spot on. Good-looking oil. Rain today will delay my finishing a video of all this till tomorrow or so