The Barzo G2. 0 4C XC Trail 29in TLR Tire Set puts a lightweight nylon casing on both wheels of a 29er cross-country or trail bike. An added protection layer in the sidewalls shields the tires on rocky trails, and the folding aramid bead forms an airtight seal on tubeless-ready rims. Four rubber compounds in the Graphene 2. 0 tread balance rolling speed against grip, so this pair of mountain bike tires covers most trail conditions at the front and the rear. What Our Gearhead(R) Experts Are Saying:"Leaning into a rutted corner, I feel the outer knobs take hold more firmly the further I tip the bike, so I know where the tire's limit is before it lets go. That made fast, loose singletrack easier to read."