Our standard tubes with Schrader Valve (SV), use a molded method of construction, ensuring a consistent thickness of butyl rubber. About SpecializedAs their moto says, “Made for riders, by riders”. Specialized made the first production mountain bike in 1974, and since then they have been industry leaders. From lightweight carbon race bikes, innovative kids bikes, class leading e-bikes and tyres & accessories, Specialized continue to push boundaries.