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Old 12-17-13, 06:31 PM
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More holes/cutouts = more surface area for cooling, the greater amount of air that gets to the disc, means more air to cool them.
(Shimano had an 'ice' system where they had an aluminium core for heat dissipation).

I guess there's also the whole 'weight' thing, but I guess that's not a concern if you're after 203mm.
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