The Maxxis Welterweight Tubes Presta RVC use Presta and Scrader valves, the perfect all-around, everyday tube.  Maxxis Welterweight Tubes Presta RVC Features 0.90 mm thick walls Puncture resistant Presta & Schrader valves Presta valve with RVC is Removable Valve Core Maxxis International is committed to delivering high performance tyres to the world. Their products are unequalled in quality and performance. With over forty-five years of manufacturing experience and the ingenuity of their people, Maxxis have created new technologies to develop their diversified tyre products.