I am one of the 19" owners initially went for aftermarket but when it came time to test fit on the M5, they did not even come close of clearing the brakes.
At the end, have to go back to oem stock 19" (which I use for winter setup). As of today, I only heard HRE is trying to come out with 19" that will fit the M5, but this was 4+ months ago or so.
If you are going to track the car, I guess you will have to get 20"... that's the only option as far as I know.
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