Slot Gap - one piece rotor slot gap/cooling vanes for 14" 4 piston S197 and 15" S550

[Duane Black]

Hi - a final thing I'd want to know before pulling the trigger on a brake kit, and I'm not sure anyone would know it - is this:

How wide is the gap for cooling vanes on the 14" rotor and 15" rotor? I've looked up various sites trying to find this information, and the only thing I can find is that they are the same width (1.260"), but I can't find anything on how much of that is actually braking surface and how much of that is the air gap for cooling.

My speculation is that it will be the same.

Would anyone know?

 

[JAJ]

It's referred to as "air gap" and it's entirely dependent on who made the rotors. Brembo racing friction rings are generally 17mm air gap, but that's just one manufacturer and one product line. You could contact the manufacturer and ask them if you really want to know.

The thing is, with a bigger air gap, you get more airflow but the rotor ends ups up weighing less. While that sounds good, the reality is that for track use in a heavy car, heavier rotors handle heat better, so it's a trade-off. The other number that matters is the number of vanes - the more vanes the better.