Everyone, I'm new to this site but definetly enjoy the wealth of information that comes from it. Anyways I'll get down to the question: I switched my stock Dunlop D208ZR SM450R tires front and rear to the Continental ContiForce SM because I had a rear blow out. First, what got me is that the stock setup from the factory has tubes in the tires (I thought that the D208 was a tubeless tire and the 17" rims had "wheel strips" in them to keep the air from escaping). Anyways thats not what really made me nervous. I put my wheels and tires back on yesterday properly and went out for a little test ride around the block. After about 5 minutes of riding around (everything seemed fine) I gave it a good acceleration trial down the main street and got the "death speed wobble" entering the 45-50 mph relm going flat out. At first I thought it was going to throw the front wheel off and I was expecting the worse, becuase of improper installation, but everything is solid, tight, travels true, and looks to be fine. My question is what do you think it could have been? I still have the jitters and am kind of scared to get back on it. Is it the tire pressure? I had about 30 psi in the front and about 25 psi in the rear. Is it the tube in a "tubeless" tire setup, but that shouldn't matter because the stocks had tubes in them? I just don't want to go down if i don't have to, you know. I'm sure I'll get some good feedback, but I just wanted to run it by you guys to see what you think.