Ultegra with Tiagra won't work, you need 105 5800 to keep it all 11 speed.
Are the mechs not 'dumb'? Always used to be that way with shimano mtb (haven't ever paid attention to Shimano road)
Oh yes Tiagra mechs will work
Edit: tiagra and 105 are so close in price though. May as well go 5800!
@umop3pisdn started
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Ultegra with Tiagra won't work, you need 105 5800 to keep it all 11 speed.