Q: How does a wider-annulus rotor actually improve braking?
A wider annulus gives the pad more usable rotor surface to sweep across, so you generate more friction and spread heat over a larger area within the same wheel space. On this set that means an 11% larger pad sweep and a 6.5% thicker rotor for extra thermal mass, all without moving the caliper. More swept area and more metal to soak up heat is what lets a heavy, fast Model S brake harder, more times in a row.
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