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The standard vittoria butyl air chamber is designed for everyday use, it is made of high quality synthetic rubber with a thickness of 0.9 mm providing good perforation resistance and airtightness. Details: butyl material. 48 mm presta valve. Removable shell. Dimensions section valve weight reference 622/700 20-28 presta 48mm 116g 1ta00010 622/700 28-42 presta 48mm 163g 1ta00075 the standard vittoria butyl air chamber is desi