Recently traded in my '08 to a new '13 (got more on trade than I figured) but the dealer asked if I would be willing to let him take the tire off the new bike and trade it with the car tire on my old bike. I told him that not only did I not mind that I would appreciate it. Service guy made me sign a form that I knew that bike was now unsafe. He then verbably asked he if what I knew what I was doing was unsafe? I told him no. But I could see there was no need to try to justify/explain my position. I am afraid that the world he lives in is still flat.