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Len sayz
"Yes, SRAM did not change the cable pull ratio when going from 10-speed to 11-speed, so a 10-speed SRAM road rear derailleur will work quite well with an 11-speed SRAM road shifter.
Read more at http://www.velonews.com/2014/05/bikes-and-tech/technical-faq/technical-faq-10-11-speed-compatibility_329731#gy3OwbB1A5q4M40h.99"
Yes and no. I think they changed the geo of the 11 speed mechs to match the gaps in the 11 speed blocks.
The shifters pull the same amount of cable [exact actuation] , ten or eleven speed, for each click.
But plug them in to an 11 speed mech and the amount it moves will be different to the same shifters plugged in to an ten speed mech.
Obvs with a ten speed block and mech you'll have a spare shift that you'll need to absorb with limit screws.
@jon. - plug it in to a ten speed mech.