M4WD Bearing Spacer M6.4 x 1.7 - M4WD-03/RE by 3Racing  [M4WD-03/RE]

M4WD-03/RE red M6.4 x 1.7 spacer for tuning bearing endplay

The red M6.4 x 1.7 spacer is engineered as a compact axial separator for Mini 4WD bearing stacks used in race setups where precise endplay tuning matters. It is supplied as a spacer element only and is intended to control axial clearance inside rollers, hubs, and gear stacks without acting as a structural axle or bearing.

For setup work, measure spacer outer diameter and thickness with calipers and compare to the bearing inner diameter and hub bore to ensure correct seating and preload. Use the spacer to fine tune axial clearance for smoother rotation and reduced friction in competitive layouts.

Assembly best practice: support bearings during fitment to avoid lateral loading and keep contact faces clean. The finish is cosmetic; performance depends on dimensional accuracy and consistent tolerances for race reliability.