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]
Action-Packed Summer Trips
Race Dune Buggies, Explore Italy, Bike Yellowstone
Plus: Fighting Poachers and Oil Companies in Congo
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