Radius rod is also called radius arm or rear suspension links. It is a suspension link to control wheel motion in the longitudinal (fore-aft) direction, keep wheels moving in sync. A high clearance radius rod, normally are arched to reduce the risk in uneven terrain. The arched structure improves the ground clearance of the whole body to avoid hitting obstacles. Meanwhile, the arched structure is more strength and more compressive. A radius rod or a clearance radius rod is made of 6061 or 7075 aircraft aluminum and with anodized surface in black or silver or golden. A completed radius rod kit includes radius rod, rod end and matching bushing and spacer and a radius rod plate.