Easton ec90 aero 55 road rear wheel clincherleading aerodynamics certified road tubeless compatibility without rim strips unrivaled braking performance outstanding durability and competitive weight the fantom rims steal the spotlight these rims are wide 19 millimeter internal rim width 55 millimeters deep and the round nose keeps them stable in cross winds you will not find a faster clincher in this category and the wind tunnel testing proves it not to mention this is the one and only