This unique bicycle disc brake rotor has several innovations. The outer track of the Shimano RT99 is highly durable steel sandwiched over aluminum. The inner fins help cool things down, dissipating 50 degrees more heat than other rotors, meaning more power and modulation without melted pads. [$80; bike.shimano.com]
Gear of the Year
The best tools, tech, and toys of 2013.
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