Tubular Tyre Challenge tubs top casings are made of Silk or top quality cotton weave called Corespun, the next level down being Super Poly. Corespun weave allows them 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 Super Poly 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 tyres 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….
– Challenge Grifo 33 Team Edition Tubular Cyclocross Tyre Cyclocross Tyres – £60 (RRP – £)
