HRSGRM57M5 - Speed Run Main Gear 0.5module 57 Tooth GROM

This product is a precision-machined main gear with a 0.5 module and 57 teeth designed for speed-run performance in GROM and similar 1/18-scale vehicles. Constructed to balance strength and reduced rotational mass, it helps improve acceleration and top-end responsiveness compared with heavier stock gears. The gear’s accurate tooth profile ensures smooth meshing with compatible pinions, lowering drivetrain friction and noise during high-speed operation. Engineered for direct replacement with standard hardware, it maintains proper mesh while optimizing the drivetrain for speed-focused setups.

• 57-tooth 0.5 module gear optimized for speed-run applications

• Precision machined for accurate tooth profile and smooth engagement

• Balanced design reduces rotational mass for quicker acceleration

• Compatible with GROM and other 1/18 scale drivetrains

• Direct replacement for stock main gear with correct mesh

• Improves drivetrain efficiency and reduces friction

• Helps deliver higher speed performance with reduced drivetrain loss