Bicycle dual inner tube system

Step 3 Place one side of the tyre over the rim

Place one side of the tyre over the rim and then insert the flattened inner tube as straight as you can. Next insert the slightly inflated inner tube - push back the flattened inner tube to get the valve stem in place then, working from both sides of the valve stem fold the flattened inner tube under the slightly inflated one (as shown in the picture) as you work your way around the rim. It takes a bit of fiddling, I never claimed it was easy.