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Last night,
I thought, 'Why not ask Cube?'
they should know the physical distances involved between the axle and the seat/chain stays.So a detailed email was sent, in hope, from their online 'Contact Us' page.
Just received an answer:
'I can recommend a Miche 11 speed 14-26 shimano cassette in combination with a 46T outer chainring (shimano makes a cyclocross specific ring for the new shimano 4arm cranks in a 46T).'
Please pardon my error upthread,
the groupset is
Ultegra 11 speed, 50/34,
with as far as I can see just the four bolting points,
So,
http://www.rosebikes.co.uk/article/shimano-ultegra-fc-6800-chainring-713812/aid:713814
would do, (realise the posrage is almost as much as the chain ring,
just happened to have a tab open on the Rose bikes webpage)