The nearest i've found is half'n'half. Tannus Armour.
There is an inner tube, there is a conventional tyre. There is also a foam tyre you place in the normal tyre with a cavity for the tube... Not only does this mean the tube is far away from the road surface (about an inch, in the case of my bike) but it's pedalled as 'run-flat' technology by Tannus, as they claimed the bike can be ran in limited form with the tube deflated.
I intend to find out. It's not easy to remove the wheels on my bike, so i'm waiting until i fit new tyres. They're not cheap, certainly not priced in line with manufacturing costs given they cost more than the tyres... but a flat tyre can cost me considerably, so i can justify it.
I'll be interested to know of any experiences with Tannus Armour, and any other such product that utilises a conventional tyre.
