Cross-drilled rotors look fast and can shed heat and gas, but you will also hear warnings that they crack. Is that true? The honest answer is: sometimes, under specific conditions. Here is when drilled rotors are fine and when to avoid them.
Why drilled rotors can crack
Drilling holes through a rotor removes material and creates stress concentration points around each hole. Under extreme, repeated heat cycling - like hard track use - tiny stress cracks can form at the hole edges and grow. Cheaper drilled rotors, where holes are drilled after casting rather than cast in, are more prone to this because the drilling can leave rough edges.
When they are perfectly fine
For normal street driving, quality drilled rotors on a lighter vehicle rarely see enough sustained heat to crack, and many drivers run them for years without issue. They can help in wet conditions and look great through the wheel. The risk rises with vehicle weight, towing, and track use - the very conditions that generate the most heat.
Drilled vs slotted vs blank
- Blank rotors - the most material and least stress; the safe default for daily driving and heavy vehicles. See drilled vs slotted rotors.
- Slotted rotors - shed gas and water without removing as much material as drilling; a common choice for towing and performance.
- Drilled rotors - best for looks and light street use; higher crack risk under extreme heat.
Who should avoid drilled rotors
If you tow, drive a heavy truck or SUV, or do track days, slotted or quality blank rotors are the safer bet. For a light daily driver where you want the look, quality drilled rotors are generally fine. Whatever you choose, pair them with the right pads and fresh hardware, and bed them in properly.