DIAL INDICATOR FOR ROTOR TRUING GAUGE PARK TOOL DT-3I.2

The Park Tool DT-3i.2 is the dial indicator that mounts on the DT-3 rotor truing gauge and turns rotor checking into a numerical measurement. The dial magnifies even the smallest rotor deviations and displays readings as small as 0.01 mm, so you can work towards a precise tolerance instead of judging by eye.

The indicator attaches to the DT-3, which in turn is mounted on the truing stand: with the wheel in place, spin the rotor and read on the dial how far it deviates at each point. The measuring tip is elongated and fully adjustable, designed to fit most disc brake rotors, including irregularly shaped ones. Compared with the gauge indicator alone, the dial gives an objective reference: measure the initial runout, work on the rotor and check the value again until you reach the desired tolerance. It is a faster and above all repeatable way of working, useful when several mechanics share the same station.

How the Park Tool DT-3i.2 dial indicator works

• Installs on the Park Tool DT-3 gauge, which is required for its use.
• Magnifies the smallest rotor deviations and shows them on the dial.
• Lets you quantify runout with 0.01 mm resolution.
• Helps bring the rotor within an acceptable tolerance, measuring before and after truing.
• The adjustable elongated tip also works on rotors with an irregular profile.

Why choose Park Tool DT-3i.2

• Numerical runout reading to one hundredth of a millimetre.
• Dedicated pairing with Park Tool's own DT-3 gauge.
• Elongated, fully adjustable measuring tip.
• Compatible with most bicycle disc brake rotors.
• Makes rotor checks in the workshop repeatable and documentable.
• Useful both for checking new rotors and for inspecting rotors after impacts or overheating.

For the mechanic who wants hard numbers rather than a visual estimate, the Park Tool DT-3i.2 dial indicator is the natural complement to the DT-3 gauge on the truing stand. Together they form a precise, tidy and easy-to-use disc rotor inspection station for everyday work, both for checking new rotors and for diagnosing those that have suffered impacts or overheating.