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Originally Posted by efahl
Actually you'd get two benefits: 1) longer moment arm and 2) more thermal mass.
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you don't get a longer moment arm unless you move the caliper / pad out to the edge of the larger rotor. otherwise, you're grabbing a larger rotor at the same radius you would a smaller rotor. more thermal mass helpful, but its affect is secondary to the longer dwell time air moving through the rotor vents.
on the downside, increased polar moment of inertia, more rotating mass, more unsprung weight.