Today, I dropped of my model S at the Fremont facility to get my 3rd row seats installed (Which I'm really excited! It has been over 7 months since I picked up my car, with my 3rd row seats not installed). While I was at the service center, I noticed another model s outside with the front wheels off as they were getting repaired. I had a chance to take a look at the front rotors and WOW they look VERY heavy ! The "hats" is what make it look very heavy. Does anyone here, know why Tesla made such heavy front hat rotors? Is there a positive externalize benefit that I do not know ? If not I'm going to design 2 pc rotors for my vehicle, perhaps it can increase my distance traveled per charge.