Now your child can customize his favorite monster machine pal with tune-up tires Blaze. Axle citys greatest hero comes with two sets of unique wheels:Â chicken tires and steel Â tires (8 wheels total). the tires can easily be removed and re-attached, and the vehicle also comes with an add-on engine accessory piece that attaches to the back of the truck. With tune-up tires Blaze, your child can explore the STEM principal of engineering. When you engineer something, you design a way to solve a problem, and then you build it. When swapping out each vehicles tires, your child is engineering new ways to get rolling. Tune-up tires Blaze also includes a storage case that holds 4 tires and the accessory piece, and doubles as a tune-up station and ramp. Mix and match the tires and accessories between all the trucks in the assortment to customize your Blaze and the monster machines .