Another one of the reasons the codifying of the Process took so long. If you say there can be a 'adder' for abnormally sized brakes, you really need to define that in the manual. That would really require calculating an 'average' sized rotor for each class, then determining a % over or under that average to apply the adder. You could even go so far as to make the argument that a core race weight/rotor size would be more accurate.

See how fun this minutia is?