Easton EA90 SLX Road Rear Wheel. The Easton EA90 SLX Road Rear Wheel is a race ready, tubeless, aluminum wonder that's also durable enough for everyday training or cyclocross usage. Easton combined their favorite features a certified road tubeless rim, wider rim width, plus a durable Echo hub and wrapped them all up into a lightweight, fiercely fast package. The EA90 SLX rolls smooth and fast, thanks in part to the wide 17.5mm internal rim. And with a durable Echo hub, the EA90 SLX wheel is built to keep rolling smooth season after season. Don't be fooled by all of the technology packed into this wheel, though, as it's easily serviceable. It rolls on standard bearings and standard double butted straight pull spokes. The only proprietary pieces are the dual threaded spoke nipples which are serviced just like standard nipples with no special tools necessary.