I'm having the same problem with my MC. Got new tires back in June/July since the old tires where 6 or 7 years old and my car starting having vibrations since then. I have replace the front rotors and pads, got some greaseable tie rods. Had the car aligned and balanced several times, rotated the tires from front to back(no change vibration still occurs the same), checked for bent rims. i still have my original struts but i dont think those would cause vibration more of a bouncey feeling. The vibration occurs slightly when in park and idle then it gets gradually worse once you hit 35-40+mph and real noticeable at 60-70mph throughout the cabin.
