There's a lot of confusion about the function of the radius arms on the Tamiya ORV (Off-Road Vehicle) chassis R/C (radio controlled) model buggies, trucks, and cars , especially with the Frog, BRAT, Lancia Rally, etc.. We take a deep dive into the ORV chassis front radius arm features and it's critical functions, plus we dig into why 3rd party aftermarket hop-up bumpers make them perform so much better than the stock Tamiya bumper mount in this episode of the RC Deep Dive podcast.