Thanks Gary for your comments. I rode the 53cm frame at the shop because that was what was built. I am a beginner with limited knowledge at this point. I did nothing but take it for a test ride.
The other week I was fitted at another shop for a 54cm frame on a Cervelo RS Rival I had purchase. The person fitting me was a racer and took measurements, etc. The process took a little over am hour.
I am assuming that o will be able to fot on the 55cm frame. Worst case will have to put it out for sale. Havd the Bianchi shipped direct to that bike shop and will do a fittong for it as well.
Cheers.