The Airstop Butyl tubes are an economical long lasting tube, with good puncture resistance. 0.9mm wall thickness for optimum puncture protection and also the butyl tubes provide better resistance to friction caused by spokes and old rim tape. 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 Type ETRTO Size Weight 032337 Schrader 35mm I4 37/47-288/305 16 x 1.5-1.9" 102g 819653 Schrader 35mm G4 37/54-390/406 20 x 1.5-2.1" 148g 198948 Schrader 35mm E4 37/47-490/507 24 x 1.5-1.85" 157g 460871 Presta 40mm C2 35/35-559 26 x 1.0-1.4" 136g 125193 Schrader 35mm C2 25/32-559 26 x 1.0-1.35" 132g 215887 Presta 40mm C4 37/62-559 26 x 1.4-2.5" 196g 125194 Schrader 35mm C4 37/62-559 26 x 1.5-2.5" 202g 514857 Presta 40mm B4 48/62-584 27.5 x 1.9-2.5" 215g 565082 Presta 60mm B4 48/62-584 27.5 x 1.9-2.7" 215g 085565 Schrader 35mm B4 48/62-584 27.5 x 1.9-2.7" 225g 688031 Presta 40mm B6 60/77-584 27.5+ x 2.4-3.1" 335g 102185 Presta 40mm A4 48/62-622 29 x 1.9-2.5" 220g 947164 Schrader 35mm A4 48/62-622 29 x 1.9-2.5" 220g