Actually, going back to this, the rim-mounted brake actually turns out to be a weight saving change, because although it's larger diameter, it's not MUCH larger diameter; and, mounted directly to the rim, it can be supported more rigidly, so it can be thinner -- plus the entire rotor carrier can be eliminated. On top of that, because the linear velocity for a given angular velocity is higher, you can get more braking effectiveness for a given size pad (though the downside is the pads heat up faster).
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