Easton EC90 SL Disc Carbon Road Rear Wheel. For those embracing the beauty of road disc brakes, this is the medium depth, aerodynamic, disc specific rear wheel that you've been waiting for. The Easton EC90 SL Carbon Disc wheel takes their proven Fantom rim shape and scales it down to a shallower 38mm depth. This rear wheel offers fierce acceleration plus impressive aerodynamics. From the spring classics to rough and tumble cyclocross racing, you'll be hard pressed to find a condition where the EC90 SL Carbon Disc is out of its element. The wheel is also certified Road Tubeless plus is entirely built by hand from start to finish and acoustically tuned. The EC90 SL Carbon Disc rear wheel combines top end materials and a methodical build for the ultimate in performance.