Michelin c4 protek max mtb tube punctures due to perforation or nipping impact edges of sidewalks in the city or rocks for mountain bikes etc are a major fear among all cyclists repairing or changing an inner tube is not always a very simple operation an inner tube must be regularly re inflated thanks to its uneven design the michelin protek max inner tube undergoes a compression reaction in the event of piercing or nipping the hole closes up naturally whereas a classic inner tube ha