Leave it to Eastonthe composites expertsto create the first zero compromise carbon fiber road clincher. The EC90 SL offers the very best braking performance in carbon rims. Period. We did it with the help of our exclusive ThermaTec brake track treatment, available only on Eastons composite clincher wheels. ThermaTec brake track treatment provides smooth, easily-modulated braking power and reduces heat build-up under heavy braking. Of course ThermaTec is only one highlight of the EC90 SL. The 38-millimeter deep carbon rim is molded into its final shape in one process, ensuring superior strength and impact resistance. The EC90 SL is the only composite clincher rim to survive tests in our laboratory for impact and fatigue resistance as well as our brake track torture test, handling temperatures up to 500-degrees Fahrenheit. Every EC90 SL is entirely hand-built and acoustically tuned in Eastons own factoryThe tubular version of the EC90 SL takes many of the same great features and brings weight down to 1,250-grams. These wheels are strong enough to handle Spring Classics like Paris-Roubaix yet light enough to win mountain stages of the Grand Tours. The EC90 SL is the one race wheelset to have if you can have just one. Thanks to a 38-milimeter deep rim and a low spoke count, the EC90 SL strikes a perfect balance between a light climbing wheel and a set of aerodynamic TT hoops.