Easton EA90 XD Rear Disc Road Wheel. The Easton EA90 XD rear disc wheel was designed with one thing in mind cyclocross. Instead of repurposing a road or 29er mountain bike wheel, Easton designed the EA90 XD from the ground up specifically for the needs of disc enabled 'cross and off road riders. This wheel utilizes Easton's proprietary tubeless rim design that holds certified road tubeless cyclocross tires securely at impressively low tire pressures. The rim is wider too, so it matches bigger volume 'cross tires perfectly. But being road tubeless is only half the story as the EA90 XD also boasts a six bolt disc rotor mount and Easton's M1 sealed cartridge bearing hub. This wheel is light, fast, and bombproof. Best of all, this rear wheel relies on standard Sapim stainless steel straight pull spokes and Easton's simple proprietary alloy tubeless nipples, so it's easy to maintain and service. To complete the wheelset, pair with Easton EA90 XD front disc brake wheel item YW XD90SLF.