ROTOR TRUING GAUGE PARK TOOL DT-3

The Park Tool DT-3 is the rotor truing gauge that bolts onto Park Tool professional truing stands and lets you check rotor straightness with the wheel already mounted in the stand. As Park Tool points out, rotors can warp from extensive use, excessive heat or impact, and even a new rotor may not be perfectly straight: the result is pad rub and reduced braking performance.

The DT-3 bolts to the truing stand and carries a finely threaded indicator that is infinitely adjustable and locks in position. Bring the tip close to the rotor, spin the wheel and pinpoint exactly where the rotor moves away from or towards the indicator. The gauge is designed not to mar the braking surface and works with rotors of any size. Wheel truing and rotor checking happen at the same station, without removing the wheel and without extra equipment on the bench: find the spot to correct, work on the rotor and check the result straight away.

Where to use the Park Tool DT-3 rotor gauge

• Checking rotors after a crash, an impact or heavy use with severe overheating.
• Inspecting new rotors before final installation.
• Tracking down the cause of pad rub or brake noise.
• Working alongside wheel truing, without moving the wheel from the stand.
• Fitting to Park Tool TS-2, TS-2.2, TS-2.2P, TS-2.3, TS-4, TS-4.2 and TS-4.3 truing stands.

Why choose Park Tool DT-3

• Measures rotor straightness with the wheel mounted in the truing stand.
• Finely threaded indicator with infinite adjustment and locking.
• Does not damage the rotor braking surface.
• Compatible with disc brake rotors of any size.
• Can be completed with the DT-3i.2 dial indicator for a numerical runout reading.

For a workshop that works on disc brakes every day, the Park Tool DT-3 rotor truing gauge turns the truing stand into a complete rotor inspection station. It pays for itself in time saved on every noise and rub diagnosis, and lets you hand back to the customer a braking system checked with method.