What's the Deal with the "Grooves" in Z4M Rotors
I had noticed these "grooves" in my rotors before, but never thought too much of it. I'm in the middle of replacing my original brakes with oem bmw rotors/pads and noticed something - the replacement rotors have grooves that span very little of the diameter compared to my original ones (see pics). So does anyone know what the design intent of these grooves are, and why bmw would change the design over time? My car is MY2007. More a curiosity than anything. Thanks in advance!
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