Legopold_DE:
Ball_bearings_in_LEGO_wheel_holder_How_to
Legopold_DE:
Wheel_holder_differences
Legopold_DE:
Comparison between standard LEGO train wheel holder and holder equipped with ball bearings.
Legopold_DE:
LEGO train wheel holder with ball bearings
Legopold_DE:
Long LEGO train video (24 cars equipped with ball bearings)