Must be error on Braking's site. A 320mm rear floating-disc does not make sense. That's larger than the front-rotor! You'd have to redo entire brake-caliper mount and slide it up swingarm. For zero performance gain since rear-brake really doesn't do anything, very odd...
yeah, I used my factory rotors down well past wear-limits before. They will actually warp and cause substantial shaking at some point and must be replaced.
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