I have an rX8 application where I need to use 15" wheels. Does anyone know if any of the brake kits for the RX7 (with smaller diameter rotors) or maybe the 10" brakes for the miata can be interchangeable with the RX8? Thanks.

With all due respect, I cannot imagiune why you would want to downsize the brakes on an RX8. It would be a LOT cheaper to use 17 or 18 " rims than to change rotors and calipers.
could you explain why you need smaller brakes?

I need to fit a 15" wheel and am not sure if it will fit over the 11.x" brakes, but it doesn't look like it will. I believe we'll have very adquate stopping power with 3rd gen RX7 brakes (used with 15" alloy wheels) for the application being considered. Just wondering if anyone already knows if they're interchangeable. Thanks.

WTF do you need 15's for though??? Why so much smaller than stock or even 17's?

???????????

Maybe he's gonna take it offroading and throw some big ole mud slingers on there...???? lol..:)

Found a solution to the problem! Thanks.

15s?????????????????????

...is somebody already preparing a SP car? But the reference to 3rd gen RX-7 brakes wouldn't be legal, so...I dunno. SM2?

apparently he's not going to explain... weird

He's probably doing that to test out a low-gearing experiment. Remember Canzoomer used 17" wheels and had greater acceleration? You guys should keep your opinions to yourselves if you think 15"s don't look bling. He specifically mentioned "I have an rX8 application where I need to use 15" wheels." It's not like he's doing it for style, which most of you are after.