The 29in Trail King is a large volume tire that uses Continental's ProTection casing with Apex sidewalls to make it ideal for long travel twenty niners. Available in both 2. 2 and 2. 4 inch widths, the Apex sidewall design uses a strip of additional material above the bead that helps stiffen the sidewall. This increases tire stability and control in hard turns and off camber terrain. The extra sidewall support also means that you can run slightly lower tire pressures without worrying about burping your tires or losing control. The Black Chili compound is a synthetic rubber with nano sized particles to react to surface irregularities more effectively. This not only improves grip, but these particles also form a tighter bond to improve compound strength, lengthening tread life and reducing the chances that lugs will rip and tear. Compared to Continental's earlier generation tire compound, Black Chili tires provide 20% less rolling resistance, 30% more grip, and an improved tread life of around 5%. The tread pattern is aggressive and designed for loose and rocky scenarios. Staggered side knobs and siping provide excellent traction over a variety of surfaces. The Continental Trail King Tire comes in either 2. 2 or 2. 4in widths and with a black sidewall only.