Maxxis 100/110/120/90-19 TR4 MX/Enduro Heavy Duty Tube 100/110/120/90-19 TR4 MX/Enduro Heavy Duty TubeAll Maxxis and CST Standard & Heavy Duty tubes are made from a special formula of high-density butyl rubber to ensure the tyre stays inflated.Our Heavy Duty Tubes are 33.33% thicker than our standard tubes.
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