Rikus!
Your rear tires have the thread mounted opposite to one another!
The Y in the middle should be pointing in the same direction in both wheels.
Did the same mistake!
Managed to unglue them without damage to the rims using the aluminum foil wrapping and cooking in the hoven at max temp for 5 - 7 min. Immediattely removed the tire by pressing with the handle of a wrench.
Nice paint job though!