The GPM Aluminum Pendulum Wheel Knuckle Weights for Traxxas TRX4 are engineered to increase static load at the wheel via stainless steel rolling beads, supplying roughly 42 grams per wheel to maintain tyre contact in crawling scenarios. The assembly pairs aluminium bodies with stainless fasteners and rollers to resist corrosion during wet or muddy operation while preserving pendulum motion for dynamic balance.