zoom Challenge Grifo 33 Team Edition Tubular Cyclocross Tyre
|Black / Brown||700 x 33c|
Challenge's Team Edition tyres have been a multi cyclo-cross Champion for years. Whether a Pro or just a hard core rider the Grifo is the tyre you need. Unbelievable grip with no rolling resistance compromise ideal for all-round conditions.
|Puncture Protection:||Puncture Protection Strip|
|Wheel Size:||700c (622)|
Challenge HANDMADE Production
All tubulars and open tubulars produced by Challenge are special, high-end, handmade products. Handmade production is a process minimizing the use of heat treatments and especially avoiding a very high heat treatment called vulcanization. In order to obtain a good quality standard, the manual skill required in each step is very high.
Our ‘Handmade’ production allows materials to maintain their original suppleness and flexibility achieving the best grip and producing an ultimate performance product. A supple Challenge tire is able to absorb and reduce harmful vibrations passing from the road to the body that are produced by riding harder vulcanized tires on stiff carbon bikes ultimately causing muscle stiffness, inflammation and fatigue.
Our very top casings are made of Silk or top quality cotton weave called Corespun, the next level down being SuperPoly. Corespun weave allows us to obtain both supple and strong, but lighter casings at the same time. These very top level casings can reach a TPI (thread per inch) count of over 320TPI. At the next SuperPoly level the TPI count can easily reach over 300TPI achieving also very strong and in fact less delicate casings than the higher cotton level.
The casings, which are sewn round with an inner tube inside, are mounted on rims and then inflated and the treads are then slowly hand glued on them. The tread is laid on the inflated casing enabling it not to suffer any tension, instead of being placed on casings which are subsequently inflated. The treads made of all natural (non-petroleum based) rubber, combined (via Handmade production) with the quality, high TPI count casings result in tires with lower rolling resistance and increased comfort offering a safer and more precise handling of the bike. The tyre absorbs irregularities of the surface with its subtle give and slight deformation, increasing road surface contact and guaranteeing both shock absorption and great grip while cornering.
Additionally, a special fabric (PPS-Puncture Protection System) is placed between the tread and the casing in order to increase puncture resistance. The casing is then sewn around an inner tube (that’s why they were originally called ‘sew-ups’) and now takes the form of a ‘tubular’ tyre with inner tube. Base tape is applied over the sewing and then this tubular tyre is glued onto a special tubular rim.
Please note that cotton tubulars require additional care, as their casings are more delicate than other materials. Though Challenge Team Edition tyres come pre-sealed with a light layer of latex, it is important to pay careful attention to wear and re-seal as raw fibers begin to show. Also, avoid heavy scrubbing, direct power washing and cleaning with chemicals or solvents as these can damage the cotton casing.
Cyclo Cross tyres are for use with road wheels to allow them to be ridden off road. They range from 30 to 35mm wide and are designed with different tread patterns to suit the various conditions that can be encountered during the Cyclo Cross season. Usually at the start of the season the ground is dry and hard so a narrower low tread tyre is needed as low rolling resistance is a priority. Later in the season when the ground is wet, grip is a priority so a wider tyre with increased tread would be the better option.
In 2003 Challengetech created its own brand “Challenge”. Challenge, as the word says, wants to point out how difficult and exciting it is to keep the tradition of high quality products, created with obstinacy, with the steady research of special materials and through handcrafted processes. Since the 2000s, Challengetech has being producing tubulars for other brands, thanks to the constant use of these products in the professional cycling.
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