hjb1000 wrote:I have checked out the tech docs of the 190 series 10-speed and 8,9,10 versions, and it confirms that the hubshell is indeed different! Note the tech diagram indicates a 2mm difference in the flange-distance.
They're not different - just offset by 2mm to one side.
hjb1000 wrote:So the question becomes, is there a special left end cap I can buy that makes it 2mm less to be compatible with 11-speed? Given the fact this hub is well and truly superseded, I suspect the answer will be a resounding 'no'.
Are you sure you have your hubs the correct way around in your photo? See the exploded diagram for the 8/9/10 speed hub - part #3 is a 2mm spacer. If you had your hubs mixed up that 2mm would be the source of your problems.
Also if you compare the parts diagrams you'll see that the hubs have the same NDS endcap but different axles.
10 SPEED ONLY:
8,9 & 10 SPEED: