The M4WD-03/BK is supplied as a replacement spacer for Mini 4WD setups requiring M6.4 x 1.7 bearing spacing. It functions as an axial spacer positioned between bearings or between a bearing and nearby component, preserving alignment and axial location in typical Mini 4WD drivetrain arrangements.
Hobbyists will appreciate that a dedicated spacer gives consistent bearing seating and helps limit lateral play from uneven stack heights. The black finish blends with darker rollers and chassis parts and serves as a useful spare during maintenance or when restoring older cars.
Fitment advice: use this spacer only where M6.4 x 1.7 geometry matches the axle or roller assembly. This is a maintenance replacement part rather than a tuning component; match it to the bearing and axle specifications of your Mini 4WD.
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