Accurately gauge the straightness of disc brake rotors while the wheel is mounted in a ts 22 or ts 2 professional wheel truing stand the park tool dt 3 rotor truing gauge features an infinitely adjustable finely threaded indicator gauge works with any diameter brake rotor park tool dt 3 rotor truing gauge features accurately gauge the straightness of any size disc brake rotor while the wheel is mounted in a ts 2 professional wheel truing stand the dt 3 features an infinitely