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I'll be daily driving my 72 runner as well as hitting as many autox and track days as possible - the trouble with the 11.75 I've read is that after a couple laps you get some pretty good brake fade which I can avoid going up to the bigger style rotors but wont be able to run my 15" for the street. i dunno how much of a gain performance wise i get by going from 11.75 to 12.2" rotors but its gotta be better i would think




If you are worried about how it will do on the track, why not just step up to a larger wheel...you can take advantage of not only a better braking setup, but modern tire technology in 17" and 18" sizes?

Unless you were limited by the class you were running in, then you might just need to get more creative with your brake package.
I have a friend in Australia who road races a Torana (like mine) in a vintage type class and is limited to 15" tires..he does run a race compound/non-street tire at least.. And he needed as good a braking as possible so went with a custom setup using new AP Racing calipers and a 12.?" rotor from memory. The rotor offset pushes as far inward as possible to give him caliper clearance to the drop area of the wheel. He used the thickest rotor as possible as well..

Just some thoughts..if you think out of the box on your brake system you might be able to come up with something if you are stuck with only the 15" wheel. (but going larger does open up possibilities to easier brake packages and tire choices though)