Park Tool, DT 2.2 Pomes En Hommage Une Maman Dcde : Mort D'une Mre Pense pour. 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 design or thickness up to 2. 5 mm. Constructed from high quality steel with a vinyl dipped handle for comfort.