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 R/C Mini 4WD Hex Hole Ball Bearing Set (4 pcs.)(15287)
USD10.13
In stock
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Description
A set of four hex-hole ball bearings sized for Mini 4WD car axles, fitted in place of the stock plain bushings to cut rolling friction and let the drivetrain turn more freely. Lower friction at the axles translates into more efficient use of motor power and higher achievable top speed.
- Quantity: 4 bearings
- Outer diameter: 6mm, thickness: 2.5mm
- Hex-hole bore for axle fitment
- Fits on car axles for smoother rotation
Because bearings mount on the axle rather than the chassis itself, Tamiya lists this set as compatible with essentially the full Mini 4WD range, from the Type 3 chassis through current releases. The hex-shaped bore is a deliberate match for Mini 4WD's hex-section axles, a design Tamiya has used across the whole product line specifically so wheels and bearings key onto the axle without needing a separate retaining pin or flat, unlike a plain round-bore bearing, which can spin loose on a round shaft under load.
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