The Barzo G2. 0 4C XC Trail 27. 5in TLR Tire Set outfits a cross-country or trail bike with a matched pair of tubeless-ready mountain bike tires that handle technical XC courses and stage races. Square knobs add stability in corners, and progressive siping bites harder the further the tire leans. Four rubber compounds in the 4C Graphene 2. 0 tread keep rolling resistance low across mixed surfaces. What Our Gearhead(R) Experts Are Saying:"I run the same Barzo on both wheels, so the front and rear let go at the same point in a corner and I know where the limit is. That matching grip makes dry, loose cross-country courses easier to read at race pace."