Easton ec90 sl disc front road wheel tubulardisc brakes are the future of road cycling theyre proven in mountain and cyclocross and with the new ec90 sl disc wheels combined to the latest brake systems there are no longer any compromises associated with going disc the ec90 sl takes the proven fantom rim shape and scales it down to a shallower 38 millimeter depth the ec90 sl disc rear front road wheel offers fierce acceleration smooth dependable durability and impressive aerodynamics fr