Lions run in hotter conditions than they did before. The wheels tend to spin inside the tires. When it's hot, the tires expand & they never move. The 1st attempt was hot gluing the tires on. That failed. The 2nd attempt was rubber cementing them on. The next attempt will be epoxy resin. The ideal adhesive would be tree sap.

After 34 miles of hard stop & go driving, the rubber cement was still holding.  The motor definitely cogs more when the tires don't slip.