The Park Tool DT-3 Rotor Truing Gauge, click to enlarge
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Item # DT-3

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Rotor Truing Gauge

Accurately gauge the straightness of disc brake rotors while the wheel is mounted in a TS-2, TS-2.2, TS-2.3, TS-4, or TS-4.2 Professional Wheel Truing Stand. The DT-3 features an infinitely adjustable, finely threaded indicator gauge. Works with any diameter brake rotor.

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DT-3 Rotor Truing Gauge