The butyle tube for lightness. Minimum weight: 25% lighter than the same size MICHELIN Airstop tubes. Smart Valve: Black Presta valve compatible with valve extenders. 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 625584 Presta 40mm CITY 33/46-194/203 12 x 1.3-1.8" 70g 791650 Presta 40mm CITY 33/46-288/305 14-16" x 1.3-18" 93g 755831 STD CITY 33/46-288/305 14-16" x 1.3-1.8" 105g 346073 Presta 40mm CITY 33/46-340/349 26" x 1.3-1.8" 77g 411696 STD CITY 33/46-390/406 20" x 1.30 - 1.80" 151g 812314 Presta 48mm CITY 33/46-490/507 24" x 1.3-1.8" 138g 792278 STD 48mm CITY 33/46-490/507 24" x 1.3-1.8" 161g 632694 PRESTA 48mm CITY 33/46-490/507 24" x 1.3-1.8" 161g 277416 STD 48mm ROAD 26/32-559 26" x 1-1.25" 145g 264535 PRESTA 48mm CITY 33/46-559 26" x 1.3-1.8" 192g 037829 STD 48mm CITY 33/46-559 26" x 1.3-1.8" 192g