There is an 11-34 11 speed Mtb cassette that will work with 10spd hubs, and the new medium cage ultegra rear mech can work with it too.
I think Shimano do a 36T and 40T MTB cassettes too but I have 11spd DT Swiss hub and I don't think they fit for some reason - too skinny or too wide?
What is stopping me building a new wheel with Shimano MTB hub for 11spd road use? Is there some spacing or disc rotor issue?
I have a wheel for sale that is 10speed Mtb hub.
https://www.lfgss.com/comments/13775726/
@hippy started
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There is an 11-34 11 speed Mtb cassette that will work with 10spd hubs, and the new medium cage ultegra rear mech can work with it too.