Product Description Specifications:Application:GravelProduct Line:RaceType:folding tyreTubeless System:Tubeless ReadyTechnical Information:Rubber Compound:Vulcanized CompoundCarcass:120 tpiModels:33-622 (700x33c) Dimensions:700 x 33cETRTO:33-622Air Pressure (max.):7.0 barsRecommended air pressure:2.5 - 4.0 barsManufacturer Numbers: black-brown: 02049black: 02044 38-622 (700x38c) Dimensions:700 x 38cETRTO:38-622Air Pressure (max.):5.0 barsRecommended air pressure:2.2 - 3.7 barsManufacturer Numbers: black: 02004black-dark brown: 02009 42-622 (700x40c) Dimensions:700 x 40cETRTO:42-622Air Pressure (max.):4.5 barsRecommended air pressure:2.0 - 3.5 barsManufacturer Number:02014Colour Index:black-brown:black-brownblack-dark brown:black-brownContents:1 x Challenge Gravel Grinder Race 28" folding tyre Manufacturer: Challenge Tires Via Montello 18 31050 Fregona (TV) Italy info@challenge-tyres.com