The e*thirteen LG1 EN MX Boost Wheelset pairs a 29in front wheel with a 27. 5in rear, a mullet setup built to carry momentum through rough sections up front while keeping the back end easier to swing through tight, technical turns. Both wheels share the same all-aluminum hub construction and 30mm internal rim width, so the size difference is the only thing that changes between them, not the durability. What Our Gearhead® Experts Are Saying:"The bigger front wheel held its line through chunky sections that used to knock me off course, and the smaller rear still snapped through switchbacks without feeling like I was fighting the bike."