When 29ers first appeared in the off-road world, the resident naysayers in the scene tried to relegate them to non-technical hardpack. While wagon wheels have since proved their worth on all terrains, Maxxis' 29in Crossmark EXO TR Tire was among the first to ensure pure speed for 29ers on fast singletrack.
The Crossmark's fast-rolling center ridge and grippy side knobs remain unchanged, but the addition of EXO sidewall protection and a tubeless-ready bead means that the tires are no more bound by the strictures of traditional technology than 29ers themselves were bound by the short-sightedness of non-believers.
Great upgrade to the Crossmark
Crossmarks have been on my bikepacking bike since 2015 (and not a single flat to show after thousands of miles), and the EXO iteration makes them an even stronger tire, with greater sidewall protection. They are fast rolling, while providing great grip in most conditions. They are a shallower tread, so not ideal for wetter conditions.