The 15-inch carbon rotor is 9.5% lighter than the stock one-piece rear rotor, dropping almost 3 lbs of unsprung weight per corner including all hardware, at roughly 2.7 lbs saved. Unsprung weight is what the suspension has to control, so cutting it sharpens ride response and reduces the mass the dampers fight. On a heavy EV, you feel that reduction rather than only reading it on a spec sheet.
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