The Tamiya 15393 JR Steel Bearing set is intended for Mini 4WD builders looking to upgrade drivetrain efficiency. Each 620-sized bearing receives a fluorine coating that limits friction and supports longer service intervals under racing use.
These 620 bearings are compatible with the common Mini 4WD wheel and axle arrangements. They suit many chassis styles, such as MS, MA and AR, and generally install without complex modifications.
Installing fluorine-coated steel bearings in place of basic bushings produces smoother wheel rotation and improved stability. That leads to steadier speed on straights and firmer control through technical sections.
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