RPM Kraton 8S front upper & lower A-arms
Made for Arrma’s popular Kraton 8S and Outcast 8S trucks are new heavy-duty front upper and lower A-arms coming from RPM. The Arrma Kraton 8S and Outcast 8S are 12kg of high-flying, dirt shredding, jump-killing fun and RPM’s replacement front A-arms are designed with the backyard basher in mind and can handle some serious abuse and come back for more. The redesigned front lower A-arms have a triple beam style construction designed to spread impact energy across all three beams. Each beam’s cross-section is 15.8mm tall and 9.5mm wide. These massive beams reduce unwanted flex during normal suspension movement, yet allow impact-absorption during those not-so-perfect landings and crashes. RPM also moved the inner cross brace away from the chassis, eliminating the droop stop entirely. While this may seem counter-intuitive, RPM’s test truck’s chassis was bent at the droop stops, clearly illustrating that extreme impacts were too much for the chassis plate to handle. After all, there’s not much worse than a bent chassis. The front upper A-arms use a dual beam construction where each beam is 12.7mm tall and 9.5mm wide. The designers eliminated the tube shape over the hinge pin to eliminate built-in moulding stresses while beefing up the leading edge hinge pin support to add some much needed strength and durability. Both upper and lower A-arms are moulded with fingernail slots that allow easy access to remove the optional aluminium support ring at the pivot ball. The arms are made in the USA from RPM’s trademark blend of ultra durable materials and they are available as left and right side sets.
