Tamiya Mini 4WD 9mm Ringless Aluminum Ball Rollers M4WD-29/PK by 3Racing  [M4WD-29/PK]

3Racing M4WD-29/PK 9mm ringless aluminum rollers in pink

These 9mm aluminum ball race rollers are an aftermarket spare manufactured by 3Racing for use on Tamiya Mini 4WD cars. The ringless bearing profile and anodized aluminum body are the main factors affecting fit and service life. The pink finish identifies this colour option for easy matching and inventory control.

Fitment notes: these rollers are built for standard 9mm roller housings and typical shaft setups used on 1/32 Mini 4WD machines. Double-check shaft diameter and spacer stacks on MA, MS, AR, FM-A, VS, and Super-II chassis before installation; the part serves as a direct replacement or visual upgrade rather than a drivetrain change.

Service tips for installers: confirm correct mounting orientation and consider a light film of lubricant on the bearing race if your setup benefits from it. Inspect for axial runout and tighten any threaded fasteners to the torque you normally use for aluminum rollers to prevent loosening under race conditions.

Cleaning and upkeep: wipe with a lint-free cloth and a mild solvent that is safe for anodized aluminum if dirt or grease builds up. Avoid abrasive pads or harsh chemicals that can mar the finish. Keep original spacers in place when removing rollers to preserve alignment.

Collector notes: the coloured anodize and ringless design make these easy to catalogue. Record any surface marks or anodizing variance when adding spares to a collection or preparing items for resale to preserve condition history.