Originally Posted by DrIsotope

I thought it was generally accepted that the butt dyno is never wrong. If a new part is installed, and the butt dyno determines that the change is positive, regardless of any actual numbers on paper, said part is an improvement. Once you start bringing math into it, the fun has most certainly died. Also, not being a math guy, I'd like to toss out there the fact that perception is reality-- if the OP feels like the new wheels are more laterally stiff, they are. No one else here can perceive his reality, we can only analyze our perceptions of his reality.

Or more likely, the Ultegra wheels are simply stiffer than what he had before, asymmetry notwithstanding.