I think what everybody is saying and I did work for a major tire manufacturer is that the cross section on an auto tire is not the same as a cycle tire. The tread is on the bottom and normally has sharper corners. A cycle tire has a round cross section because two wheels lean when turning whereas four don't and that's why there is usually squealing on high speed turns. Further...Cycle tires are a lower durometer (softer) rubber for better traction whether straight, stopping or turning. That's why they wear out faster.
Now if you are going to Drag race your Xciting in a straight line you may be ok. Besides that, your center of gravity is higher and that can only accelerate problems. This is not to say that I have seen Motorcycles with Auto type tires. Let us know how this works out for you.....
