You'd probably end up having to replace all of the chainrings, and with fairly ugly ones as the Shimano 11 speed stuff has all moved to 4 arm cranks.
Also reading the bikeforums thread, are there any tandem hubsets that will take a 11spd cassette?
If not it might be possible to replace the freehub with the SRAM XD driver body and use SRAM 11 speed cassettes.
Maybe.
@Howard started
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You'd probably end up having to replace all of the chainrings, and with fairly ugly ones as the Shimano 11 speed stuff has all moved to 4 arm cranks.
Also reading the bikeforums thread, are there any tandem hubsets that will take a 11spd cassette?