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Originally Posted by AtomicLabMonkey
Cup teams use small diameter rotors because NASCAR mandates a maximum wheel diameter of 15"; their packaging constraints within such a small wheel are what limit them to relatively small braking systems compared to what teams in most road racing series use.
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Sorry, you are right, I was thinking of NASCAR only at the time. I do think it is all the NASCAR series, not just the cup, but that isn't really important and I may well be wrong on that count as well.
Most production car based series are limited to a 17" wheel which keeps to 14" rotors, though there is often a weight penalty for using larger rotors. Many open wheel series have 13-15" wheels, so they are on 12s, and smaller. WRC uses about 12" on everything but tarmac where they use whoping 14.4"ers.
I guess my point was we don't push them anywhere as hard as these guys do, and they run for many more miles etc.