front A-arms for the HPI Baja 5B & 5T are designed around the stock A-arm geometry, which means they are direct fit replacements – no additional parts or accessories are needed. The list of improvements from there is extensive! To start, we’ve eliminated most of the hard rib angles in favor of smoothly contoured curves that enhance survivability during extreme impacts. Both the upper and lower A-arms incorporate much larger and stronger corner webs than the stock A-arms while RPM lower A-arms have a redesigned center brace structure that helps the rigidity and strength considerably by spreading impact energies over a much larger area.

After extensive in-house review of 5B & 5T A-arms in stock form and listening to Baja owners, we found that the stock pivot ball socket tends to break out under certain impact conditions. We addressed this problem by adding nearly 15% more material around the diameter of the pivot ball socket and we redesigned the shape of the socket to add more support and improve crash survivability without creating any interference with suspension or steering movement. While we were redesigning the pivot ball area, we reduced the amount of slop in the ball socket to help improve and maintain more consistent camber and toe angles for smoother, more precise steering.