ST Racing Steering Knuckle - Rst/St/Bdt w/5x11mm Brgs (4) Silver Using high quality CNC machined aluminum, these oversized Aluminum Front Steering Knuckle greatly increase the strength of your front suspension, while adding great looks to your Traxxas electric Stampede/Rustler/Bandit or the new Slash. Because of the increase in size of bearing for durability, ST Racing has included a full set of 5x11mm ball bearings (replacing the stock 5x9mm bushing) for improved efficiency of the rotating axle and durability.