Originally Posted by
MichaelW
You can get inner tubes which are not circular, just closed sausages of rubber with a valve in the side. You can fit and remove them without removing the wheel.
I think that these are out of production for a number of years now. My vague recollection is that they were made by Specialized and had the term 'snake' in their name. I have one somewhere in my collection, though presumably its rubber has lost some of its original elasticity by now. In any case, they were specifically intended for repairs without taking off the wheel and were intended to be pushed in on the side of the original but now flat tube. I have been pondering whether one could make such a 'snake' out of a regular tube.