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

Any rigid flat object will do for this step.

Carefully run the 19 mm socket wrench along the edge of the tire all the way around and bend the wrench down to pop the tire out 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.

Carefully feed the air valve through the hole in the rim before removing, or you could tear a larger hole in the tire.