Originally Posted by
sooprvylyn
Any time you work on a bike there is a chance of messing it up.
Can't help much with the BB- sealed bearings? If so then they might just be a bit sticky from storage, could heat up up with a torch(if there are no plastic dust covers on the BB or Bearings) for a second to see if that helps. If the BB went in nicely without too much trouble you probably didn't cross thread it. Might put some grease on the spindle too.
This is not good advice.
The OP needs to know that
1) The preload bolt torque is 1.5nm. This is very light. It does not secure the crank. The two allen bolts on the left crank do this
2) External BB crankset like that ultegra don't typically spin very well at all new. This is normal. There is obviously normal, and then too tight even for that. It will never spin as well as a loose ball cartridge bb or a campy type square taper bb.