Have you considered the rear tire increase in diameter as it is spinning at 150 MPH?
Gee i never thought of that one Steve. I think SOMEONE has too much time on his hands. Maybe you can research that for us!
This is from a HD forum. I’ll try to FIND more. JD750ace should be able to answer my question. He’s the tire expert.
The air in the tire does heat up and expand. There will be an increase in dia. and width. But it is relative to the situation!
But basically the cold dimension of the tire is less then the hot. Air expands and it has to go somewhere. So unless you release the pressure it will change the dimensions. But the size increase from the manufactures specs. will vary depending on the starting pressure.
These days companies fill the tires with Nitrogen because it is less prone to expansion. Make for a more consistent tire, and ride.
So the amount of increase in size from expansion is dependent on many factors. Best you can get is a ball park idea of what that is, and that it does occur.
And really it's nothing that the "average joe" needs to be concerned with. If your tire clearance is that close?? Just making turns will make your tire rub. Because the tires leans and distorts as directional forces are applied.