The Pirelli TR01 Triathlon is an updated version of the TR01 for the 22.5" truck sizes. The Pirelli TR01 Triathlon is an extremely versatile tyre, suitable for regional and long-haul use in all conditions. High mileage, low rolling resistance, low noise and outstanding grip - even in winter conditions - make the Pirelli TR01 Triathlon an extremely capable and reliable tyre.