Easton EC90 XC 29er Carbon Mountain Rear Wheel. With the Easton EC90 XC 29er carbon mountain rear wheel you can have both race ready weight plus ride every day durability all in one exceptionally well crafted wheel. In fact, the EC90 XC is the lightest UST 29er wheel on the market. Strength wise, this wheel is unreal as well as it features the superior impact resistance of Easton's proprietary ABC Armor Ballistic Composite materials. It's similar to the stuff the military uses in ultra light body armor and other ballistic applications. Thanks in part to Armored Ballistic Composite you'll find your wheels spinning straight and true after seasons of abuse. These wheels can shred rough trails all week long and then go on to win World Cup XC races on the weekend. Its UST compatibility out of the box takes the stress out of riding tubeless and the M1 221 hub is easily convertible to accommodate both 10x135mm quick release and 12x142mm thru axle set ups. To complete the wheelset, pair this rear wheel with the Easton XC 29er Carbon 15x100 Front Mountain Wheel Nashbar item EA C90F15.