Our standard tubes use a molded method of construction, ensuring a consistent thickness of butyl rubber. Buy 5 tubes and only pay the price of four! Use discount code TUBE5PACK at Checkout. About SpecializedAs their motto 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.