Insert the 19 mm socket wrench between the rubber tire and the metal frame.

Any rigid flat metal object can be used for this step.

Carefully slide the 19 mm socket wrench all the way around the tire. Bend the wrench down to pop the tire out of the bead of the rim.

When undoing the tire, be careful using the back of the wrench because the tool can damage the tire tube and or wheel frame.

Reach inside the tire and remove the tube from the metal frame.