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As Mark states above some of it is to allow grit a passage away from the pad/rotor interface.....and it also allows for the pads to gas-out and not float on the hot gases reducing grip.
It also means less mass at the braking surface....so it cools off faster. Now it also heats up faster and higher so it might be a net zero deal.
The curved arms are designed to allow the disc to swell when it gets hot while still running true. Some rotors are prone to running clean when cool but then coming out of true and rubbing when they get hot.
Lastly - one can not overlook the huge factor of aesthetics....I can only imagine the back room battles between marketing and engineering with stuff like this. The simple fact of the matter is that much of the bike biz has become a fashion business over time and true function is not the primary goal. I get it - companies need to move the SKU's and people buy stuff based on the looks more than anything else. Sell the sizzle not the steak.
dave
Last edited by David Kirk; 11-12-2019 at 05:35 PM.
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