Originally Posted by
am8117
Are you sure? I mean the chains were getting narrower ever since ... 7-speed? The FCs are marketed (I understand that may be marketing only) as if it mattered ... e.g. 2x10, 3x11, etc ...
They've been narrowing the external width of the chains, peening rivets, etc. But the internal width is largely still 3/32, or perhaps 11/128". What an odd size...
https://bike.bikegremlin.com/1220/1-...compatibility/
So, your 11 speed chains will largely be happy with 9 or 10 speed chainrings. But, you do run a small risk of dropping the chain between chainrings.
They did thin the rear sprockets slightly. That may well help pack the sprockets tighter together.