Always true for sport (bigger front brakes) in both '05 and '04. Interesting to note, unless I have a misconfigured 4Runner, adding the 17" wheels as a factory option (that's the way it came from the factory), also included the bigger brakes. A friend who has a lift asked me when I changed the front rotors, he had seen a couple of other SR5's and the front and rear rotors were the same. I said I didn't. He said the front rotors are just over 3/4" bigger than the rears. Same dimensions as the sport brakes... Maybe that $100 option also includes bigger brakes or I just got lucky in a misconfiguration...