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|  | | | | Vredestein Fortezza Quattro 700Vredestein Fortezza Quattro is a high performance competition tyre renowned for its outstanding performance in both wet and dry weather
Grips superbly on bends, carried Robbie Mcewen to the green jersey on the 2006 TDF
The emphasis is on better puncture protection and moulding, to permit optimum performance all year round.
The unique design has a flat central zone with a sloping diamond structure across the shoulder of the tyre. The extra protective layer gives optimal puncture protection, so that not only the tread but also the shoulders and side walls are now also better protected against punctures. - Equipped with PRS Puncture Resistance System
- Triathlon and road
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PUNCTURE RESISTANCE SYSTEM (PRS)
Vredestein's patented system approach to puncture reductions. Unlike other brands that rely upon increasing the quantity of rubber in the contact patch area or tout their utilization of multiple belts or plies, Vredestein takes a unique approach. The PRS layer is actually a separately made layer of harder rubber (approximate durometer of 73) that is vulcanized between the casing and the tread. This separation and different density is what lends Vredestein Tyres such proven puncture reduction--up to 80% over other brands as independently tested by a leading German University*.
To develop a mental image of how punctures are reduced by the PRS, imagine the performance of bullet- proof glass. Bullet-proof glass performs its stopping function by requiring the projectile to repeatedly overcome a series of barriers of high surface tension. With every layer, more force is taken out of the projectile until it loses all of it's forward momentum and stops. In the very same way, the Vredestein PRS layer reduces punctures. You know the scenario: A shard of glass or wire from an auto radial tyre enters the tread. Once the surface of a tread is cut, the rubber, as a natural result of its compliancy, gaps open and ceases to provide much of a barrier. At this point, it is a fairly clean shot for the object to begin cutting away at the casing--not in a Vredestein PRS tyre! The PRS layer requires that the object expend more energy overcoming its higher surface tension. And in over 80%of the cases, sapping the remaining energy of the object at this point is enough to prevent the object from penetrating any further. The object either becomes lodged in the PRS layer at this point or eventually gets scrubbed away. And if in fact the object EVEN makes it through the PRS layer, it is now up against THE strongest fibre used of any premium bicycle tyre on the market today!
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