Competitive Double 8-9mm Aluminum Rollers M4WD-33/RE (red) by 3Racing  [M4WD-33/RE]

High-precision double 8-9mm rollers for Mini 4WD tuning

Engineered for racers and tuners, this compact double-roller set provides low rotating mass and improved surface hardness through red anodizing. The paired 8-9mm rollers are produced to suit tight tolerance builds where consistent rolling behavior and resistance to surface wear are required.

Compatibility hinges on shaft diameter and mount clearance; confirm axle bore and spacer stack before installation. These rollers fit standard small-diameter shafts and most two-piece mounting systems used on Super-II, MA, MS, AR and comparable performance chassis, but always validate on modified frames.

Assembly guidance for technical users: check axial alignment and lateral runout, apply light film lubrication where bearings are absent, and torque fasteners to specification to avoid distortion. Inspect the anodized surface post-install for any compromise and replace rollers that show structural damage. These components are intended for precision replacement and tuning applications rather than generic kit parts.

Service recommendations: schedule periodic inspections for runout and wear, and use matched bearings or bushings to maintain optimal tolerances and repeatable on-track performance.