Overview Eliminate axle and drivetrain slop on 4mm-diameter shafts with the Hot Racing Steel Shim Set in 4x5.4x0.1mm. This 10-pack of precision steel shims is purpose-built for shimming 4mm-diameter axles, gears, and other small drivetrain components — perfect for 1/10 and 1/16 scale RC builds where every bit of efficiency matters. Shimming is one of the most important — and most overlooked — performance tuning steps in RC. By eliminating end-play slop in the drivetrain, you reduce vibration, increase efficiency, and extend component life. Smart builders shim everything; this is your kit for the 4mm-diameter components in your build. Key Features Precision steel construction 10 shims per pack — enough for multiple builds Designed for 4mm-diameter axles and components 0.1mm thickness for fine tuning Reduces slop between drivetrain components Performance Benefits Eliminates end-play slop in 4mm axles and gears Reduces vibration and gear chatter More efficient power transfer through the drivetrain Extends the life of bearings, gears, and seals More predictable, consistent vehicle behavior Usage Notes Use a feeler gauge or trial fitment to determine the correct number of shims for your application. Stack multiple shims as needed to achieve the right end-play. Note: manufacturing tolerances of approximately +/- 0.02mm may be expected. Inspect for burrs and clean before installation. Technical Specs Material: Steel Inner Diameter: 4mm Outer Diameter: 5.4mm Thickness: 0.1mm Tolerance: +/- 0.02mm Quantity: 10 shims per pack What's Included Ten (10) 4 x 5.4 x 0.1mm steel shims Fitment Any RC vehicle drivetrain using 4mm-diameter axles or components Universal fitment across many 1/10 and 1/16 scale platforms Compatible with gearboxes, differentials, and axle housings using 4mm shafts Summary The Hot Racing Steel Shim Set in 4x5.4x0.1mm is the precision tuning kit every 4mm-axle RC builder should keep in the toolbox. Eliminate slop, raise efficiency, and bring your drivetrain to its best.
