I have a 2009 Orbea Onix Dama and I *think* my seat post is 31.8.
You could try to contact Orbea directly also for your specs.
Congrats! Orbeas are sweet bikes.
EDIT ADD: p.s "...I would hate to have the frame sitting in the GARAGE just calling to me..."....g a r a g e ??? *gasp*, oh girl, priorities lol, my Orbea, nicknamed Candy (because she's pink and white like cotton candy AND she's sweet lol) sleeps across from the foot of my bed. To get her there after our rides together I carry her shouldered / craddled in my arms and put her there to rest.... AND you have a Diva coming... throw some furniture out in the garage if you must... to make proper room for the bike inside the house.



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