[JdBn]

First of all, not that I am going to fit i8 rotors to an f3x.. But I am considering f3x front brakes on my e91 and actually stumbled across a set of i8 rotors and calipers, and it seemed that the calipers look completely the same as the f3x 4-pot calipers, except for the color. Oddly, the discs are 29 mm thick instead of 30 mm for the f3x which might indicate that the calipers are not the same.. Anyone who knows if the pickup points etc are the same? If the discs and calipers could be swapped between the f3x and i8 it might give me an additional option, with the advantage of less weight for the i8 discs. Anyway, if this is possible it is also an option for anyone with a 340 mm M-sport system looking to save some unsprung weight!

[juld0zer]

There isn't a lot of info available but I suspect the i8 front brake setup is similar to the F5x MINI JCW front brakes, ie same family of caliper by Brembo but shallow offset disc and thinner pads.

Whether it will fit or not, i think you will need a spacer to clear the caliper. A very big one