The GPM TRX4023XL brass pendulum wheel weights are engineered to increase rotating mass at the wheel hubs of the Traxxas TRX4 Trail Crawler. By concentrating weight at the wheel knuckle and axle area, these brass weights improve tyre bite on uneven surfaces and reduce unwanted wheel hop during low speed manoeuvres. Installation uses the included hardware for a secure fit and keeps clearance similar to stock components.