Mini 4WD Bearing and Drivetrain Efficiency
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.
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Browse available alternativesA set of four 620-size steel ball bearings finished with a low-friction fluorine coating. The coating reduces rolling resistance and wear compared with uncoated bearings, giving smoother, more durable rotation when fitted to wheels or rollers sized for 620 bearings.
620 is Tamiya's designation for one of its standard small bearing sizes, used at various shaft positions across the classic Type 2 through Super TZ-X chassis lineup as well as the current MA and MS chassis, reflected in the wide chassis compatibility list for this part. Unlike the plain steel bearings sold elsewhere in the range, these carry a fluorine surface coating -- the same low-friction treatment applied to Tamiya's coated gear shafts -- combining the durability of steel construction with lower rolling resistance than an untreated bearing, without the cost of switching to a different bearing material altogether. Four per set is enough to fit every position needing this bearing size on a single car.