Schwalve has strived relentlessly to increase the speed of the Ultremo and installed the ZX with their HD Speed Guard and RaceStar Triple Compound. Both components are perfectly tuned to the requirements of an outstanding competition tire. The result: Significant reduction in rolling resistance. They have also used additional material to reinforce the tire shoulders and to ensure a considerable increase in mileage. ZX - the best Ultremo ever!
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