Originally Posted by
AlmostTrick
That an "amazingly stiff" frame would ride like a rock makes sense. But not that tires and tire pressure "didn't make a difference". It seems strange to me that someone who can't feel a difference in tires/pressure would be able to feel a difference in frames. Surely tires make a greater difference.
How many aluminum frame bikes have you built up and ridden, with exact swap of parts from one frame to the other? I have done it multiple times, and absolutely experienced significant differences among aluminum frames. Wheels and tires absolutely make a difference, just as frame absolutely makes a difference, and seat post absolutely makes a difference.