Challenge strada bianca tubeless vulcanised tyrehandmade in italy, this gravel and hardpack suited tyre from challenge is robustly created to take on rugged routes and tough tracks'. '.strtoupper('f')eaturing a bold 120 tpi nylon casing, vulcanised for added protection, it stands up brilliantly to the rough and tumble of such riding for a confidence inspiring performance on every outing'. '.strtoupper('g')iving you fast rolling and cornering, this world class tyre is a perfect upgrade for riders who want maximum control in all riding conditions'. '.strtoupper('f')eatures tubeless ready yes use rough road, cobbles, big riders, hard packed dirt size 700 tyre width 36mm internal rim width 17 23mm tpi 120 bead aramid casing nylon bar 2 3.5 psi 30 50 weight 380gtechnologies vulcanized tubeless ready vtr the highest level of performance offered by car, truck and motorcycle tyre manufacturers is a vulcanized tubeless system'. '.strtoupper('w')hile this is an old technology for cars and trucks, for bicycles it is relatively new and did not even have an internationally accepted design standard iso or etrto until recent years'. '.strtoupper('b')y eliminating the inner tube it is possible to lower the weight and create a softer, more comfortable, more efficient, lower rolling resistance tyre system by running lower tyre pressure'. '.strtoupper('c')hallenge started introducing vulcanized tubeless ready vtr tyres in recent years because the iso and etrto standards for proper vtr tire and rim fit have finally been completed'. '.strtoupper('t')hese standards ensure your safety and your ability to fit and service the tyres with hand tools.buy challenge wheels tyres from chain reaction cycles, the world's largest online bike store.