Volume, speed, and consistency. The Cross Boss’ even center tread shelf provides smooth and fast acceleration while more open side knobs help clear muck. A rounded, high volume profile designed ground-up for tubeless usage provides plenty of room to modulate tire pressure while dual compound, Dual DNA rubber and defined cornering channels keep riders grinning for more turns. From single track to the circuit, the Cross Boss is here to bring it. Features a 60 TPI casing and is TCS (tubeless compatible system) ready.WTBs TCS (Tubeless Compatible System) tires feature the best of both worlds: they boast the ride benefits of a tubeless tire with the minimal weight of a race tire. This versatile system combines WTBs lightweight Race casing with a tubeless UST bead. TCS tires work great with inner tubes and easily adapt to tubeless when combined with WTB-approved sealant and rim strips (like Stans Tire Sealant).Also feature’s WTB’s DNA Dual Rubber compound: The centerline compound features 60a durometer rubber for fast rolling, precise steering and durability. The dense, slow-rebounding 50a durometer outer tread provides exceptional grip and shock absorbing properties.