520, 620 or Hex-Hole? A Mini 4WD Bearing Buying Guide
520 and 620 describe size categories; hex-hole describes an interface. Identify the location and exact part before deciding what to replace.
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Tamiya Mini Round Hole Ball Bearing Set (4 pcs.)(15111)
USD10.13
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Description
Four miniature ball bearings with 2mm bores, sized for the counter gear shaft in Mini 4WD high-speed (4.2:1 and 4:1), high-speed EX (3.7:1) and super-speed (3.5:1) gear sets. Replacing the stock plastic bushing here with a ball bearing cuts friction at one of the more heavily loaded points in the drivetrain, for smoother, more efficient power transfer to the wheels. Not compatible with Mini 4WD PRO cars, which use a different gearbox layout.
Outside of that PRO exclusion, Tamiya lists the set as fitting essentially the full modern chassis range — Type 3 through Type 5, Zero, FM, FM-A, Super-1, Super-II, Super FM, Super TZ, Super X, Super XX, Super TZ-X, VS, MS, AR and MA chassis are all named — so the PRO caveat above is the only real fitment check needed before ordering rather than the chassis itself.
- Quantity: 4 bearings
- Bore: 2mm
- Compatible gear sets: high speed (4.2:1, 4:1), high speed EX (3.7:1), super speed (3.5:1)
- Not compatible with Mini 4WD PRO chassis
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