Originally Posted by
AndrewJB
I am assuming the rattling is from the rear DR.
The first thing that comes to mind is you didn't thread the chain through the jockey wheels correctly. There is a tab of sorts on the upper jockey wheel frame that some folks often run the chain over instead of under. But I would imagine you would have major issues in all gears in that case.
The next is...did you install all required spacers on the cassette?
Yes, the chain is threaded correctly through the rear derailleur cage. No spacers are need for the cassette, as I am using an 11 speed cassette on an 11 speed hub. It is hard to tell where exactly the noise is coming from, but if I had to guess, my inclination would be to point at the chainrings. When the chain is making noise, like I described above, I feel slight vibrations in the crankset.
It's almost as if the chain isn't sitting properly on the chainrings and rotating the crankset causes the chain to vibrate. Perhaps the chainring is mis-shaped? Though not enough to be visible to the naked eye, but enough to cause the chain to vibrate against it?
Or perhaps the crankset isn't straight, thus affecting the chainline, which in turn cause the chain to be at a weird angle?