Mini 4WD Gear Set Compatibility Guide
Choose a Tamiya Mini 4WD gear set by the exact chassis, motor layout and instructions. Check ratio, gear cover and event rules before changing the drivetrain.
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A set of four metal bearings for Mini 4WD, sold as a maintenance replacement item for when the plastic bearings or eyelet bushings on a chassis have been lost or worn out. These fit the standard bearing positions used across Tamiya's Mini 4WD chassis lines.
Tamiya catalogues this as an AO Parts item — its aftermarket option-parts line for small maintenance and replacement components rather than full grade-up kits. Several current kits, including the VZ-chassis Iron Beak and Ray Spear, ship stock with plastic 620 bearings moulded in low-friction POM; metal bearings like these are the classic aftermarket step up from that stock plastic, valued for lower rolling friction at the gearbox and axle positions where efficiency losses add up over a race.
Choose a Tamiya Mini 4WD gear set by the exact chassis, motor layout and instructions. Check ratio, gear cover and event rules before changing the drivetrain.
A Mini 4WD one way wheel cuts drivetrain drag through corners. Bearings, shaft trueness and gear mesh, and how to measure what you actually gained.
We counted every non-kit SKU in our own 289-item Tamiya catalogue by named chassis. MS, AR and Super XX lead, but two-thirds of parts name no chassis at all.