This is the Challenge Pista Seta Ultra Tubular Tyre strong and light at the same time, has outstanding features the Veledrome tracks. When speed is key and you have no time to think the Challenge Pista Seta Ultra Track Tubular is the tubular to rely on. This tyre features a silk carcass, which is stronger, lighter and more supple than all other carcasses.
All tubular produced by Challenge are special hand-made products. Machines are not able to produce them and the manual skill required in each step to obtain a good quality standard is very high. The casings have a high TPI count that can reach over 300 tpi.
Their production avoids any vulcanisation processes to enable all materials to keep their suppleness and flexibility. The tread is slowly hand glued on the casing which is previously mounted and inflated on a rim. By using this method the tread is relaxed on the casing and does not suffer any tension when inflated. The result of this is a lower rolling resistance, increase in comfort, more precise handling of the bike and better grip.
Hand made tubulars are well known by professionals and is this type of tyre that is preferred for the long stage races. To give the best possible grip in curves Challenge uses the most updated materials to obtain flexibility, suppleness and this results in absorption of irregular surfaces giving to the cyclist the best possible contact patch.
The wheel avoids jumping and the tyre will deform and absorb the irregularities acting in some way as a shock absorber. Comfort means reduction of harmful vibrations for the wrists and neck, these vibrations, will end causing inflammatory problems, as a hard tyre will transfer all the vibrations directly to the racer body. If you have never tried a ''hand made'' product, go to a local shop and ask to see one. Touch the product and look at its construction and the side walls. You will immediately notice the difference.
Non-vulcanized - Ultimately the major difference between a Handmade Tubular or Open Tubular and the majority of clinchers is that it will avoid the heat and pressure process called vulcanization, which most tyres undergo in production. It is used to bind the materials, but compromises the ride quality when the rubber gets stiffer. Treads are hand-glued onto Challenge Tubulars and Open Tubulars, and the latex and rubber maintain their ideal quality.
Thread count (TPI) - Thread count plays a major role in the weight, suppleness and durability of Tubulars and Open Tubulars. The higher the number of threads per inch (TPI), the thinner each individual thread, making a thinner and lighter casing and a more supple tyre. Their lower TPI casings are thicker and more durable.
Casings - They offer casings made from silk, cotton or polyester. Silk provides the highest ride quality, with threads so fine they don't measure the thread count, and is stronger than cotton and polyester. Corespun cotton casing is lite and supple, and available up to 320TPI for maximum control and performance. SuperPoly and Poly polyester casings are less expensive and more durable, still providing the qualities of top-end tubulars.
Rubber - Their treads are made from locally-sourced natural rubber in their own factory in Thailand. Not only is natural rubber more supple than synthetic rubber — which accounts for the majority of the world's tyre production — the grip is far superior.
Puncture Protection Strip (PPS) - An extra layer of uniquely-crafted fabric with highly resistant properties sits between the casing and the tyre to reduce the risk of punctures. Tyres intended for use in intense conditions with a high puncture risk are reinforced with a second PPS layer beneath the casing.
Seamless latex inner tube - Their Seamless Latex Inner Tubes are also produced in their own factory from locally-sourced materials and are either sewn inside their Tubulars or sold individually to be mounted onto an Open Tubular setup. Latex has elastic and absorptive qualities that enable a larger point of contact than a butyl tube. The added elasticity reduces rolling resistance and enhances comfort and speed, making latex an ideal material for racers at the top level of the sport.