Solveg, Sorry to turn this thread back on itself again, but what tires are you running on the Klein? I know a couple people in our bicycle club who ride them, and they have no problems with longer distances. I know that the frame material can make a difference, but geometry, tire size and tire pressure can also have a lot to do with the ride characteristics.

Hope you get this all sorted out.

fwiw - this past year I rode a slightly too small for me Bob Jackson. 20.5" ctc seat tube, 20.5 ctc top tube with a disproportionately long (120 or 130 mm) stem. The bicycle turns like nobody's business, and yet was quite stable at speed - even in turns. What I'm trying to get at, is to tell you not to give up hope on that Peleton frame. It may be just exactly what you're looking for.