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 has an "extension" reaction (balloon effect). This self-plugging effect is enhanced by adding the preventive sealant originally supplied. Specification table, td { padding-top: 5px; padding-bottom: 5px; padding-left: 5px; border-collapse:collapse; border-spacing: 2px; color: #0945B2; } th { padding-top: 8px; padding-bottom: 8px; padding-left: 8px; border-bottom: none; background-color: #FCE500; text-align: left; font-size: 10.5px; color: black; } tr { border-bottom: none; font-size: 10.5px; } tr.blue { border-bottom: none; background-color: #E6F6FC; } PART # Valve Length (mm) Type ETRTO Size Weight (g) 477029 Schrader 35mm G4 37/47-406 20 x 1.5-2.125 210g 951590 Presta 40mm C4 47/58-559 26 x 1.9-2.25 330g 443122 Schrader 35mm C4 47/58-559 26 x 1.85-2.25 330g 306656 Presta 40mm B4 48/62-584 27.5 x 1.9-2.6 355g 421612 Presta 40mm A4 47/58-622 29 x 1.85-2.5 370g