Arm Bar gets right into the descent from the intersection with Darkside. It heads out west and then wraps around the mountain to the north. The tread quickly narrows as the grassy hillside falls away steeply. The trail also becomes increasingly technical. Exposure is a key element here as you ride a tightrope across the hillside, navigating various sections of rock, including one major armored drop.
The upper challenge section is followed by a fast section down to a level section that turns into a stand of trees.
From here, the trail changes direction and steaks back onto the hillside, through two major switchbacks. The upper one is tight and technical with some rocks, the lower one is steep and banked around a twisted oak tree.
Continue south from here through a long run of singletrack that intercept more sections of rock and oak trees.
The last part of Arm Bar travels through one extended stand of trees before hitting one last section of rock challenges. The last bit rolls out and around the south side of the mountain to the intersection with Breakdown.