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it does look like the 9/10/11 is slightly narrower
Don't just look, measure. 9/10/11-speed chain is all 11/128" roller width.
gbj_tester-
So I measured...
They are actually different widths. My vernier calipers have run out of battery but using my extremely precise 'ruler' method (very much not Tester approved), the 11 speed one is a shade under half a millimetre thinner at the base of the tooth 'trough'.
Anyway, very encouraging to know that the internal widths are the same, and what with the important new discovery of this Zephyr chainring in my parts bin, I am now at liberty to just try it out in real life. If it works it works, if it doesn't I'll get something that says 11 speed on the box and the Zephyr can go back to waiting for my other bike to need a new chainring.
.gaz.
Cheers, will probably just give it a go.
Is there a big difference in the internal width of 10 and 11 speed chains that might make a difference?
Turns out I actually have both a 9/10 speed Zephyr and a 9/10/11 speed Zephyr in the parts box ( both bought as 10 speed) and it does look like the 9/10/11 is slightly narrower, which makes me think twice....
But if enough experts on the internet tell me it'll be okay then I'll quit my worrying ways and throw a fraction of a millimetre to the wind!