Rotor Truing Fork Park Tool DT-2.2Rotor Truing Fork Park Tool DT 2. 2 Bicycle disc brake rotors can become warped from extensive use, excessive heat, or impact. Even new disc rotors may not always be perfectly straight, causing annoying pad rub and affecting performance. The Park Tool DT 2. 2 is specially designed and precisely manufactured to gently adjust bent bicycle disc brake rotors. The DT 2. 2 features one long slot and two short slots for maximum compatibility with any rotor