The 3t arx ii pro stem arx ii is an evolution of the well liked arx alloy stem which has found a place on every sort of bicycle since its launch in 2007 its a subtle refresh of this classic design the faceplate is drawn in tighter at top and bottom for a more ovalized frontal appearance while retaining the cutout 3t logo the sides of the extension are slightly flattened for a more sculpted look by comparison with the tubular section of the first generation arx a single m7 bolt