The Mazza XC-Trail 27. 5in TLR Tire Set outfits a 27. 5in mountain bike with two tubeless-ready tires for trail and cross-country riding. A siped center tread rolls fast and resists drifting on off-camber ground, while stepped lugs on the outer edge bite when the trail turns loose. The 4C Graphene compound layers four rubbers so the tread holds under hard cornering and braking. What Our Gearhead(R) Experts Are Saying:"On technical climbs the ramped leading edges of the lugs roll up and over ledges instead of catching on them. That kept my rear wheel driving through rocky steps."