Mini 4WD JR Double Aluminum Rollers 9-8mm by Tamiya 15403 - slim profile handling kit  [15403]

Tamiya 15403 JR Double Aluminum Rollers 9-8mm - slim dual-roller setup

The Tamiya 15403 JR Double Aluminum Rollers (9-8mm) provide a compact dual-roller arrangement aimed at better vehicle balance. The arrangement places a 9mm roller lower than an 8mm roller to refine side-to-side response.

Design Intent and Compatibility

These aluminium rollers reduce stiction when rubbing the track border, allowing smoother transitions along rails. They are compatible with both Mini 4WD and Mini 4WD PRO platforms, making them a practical upgrade for many racers.

On-Track Benefits for Club Racing

When used on circuits with tight turns, the dual sizes help the car hold its line and keep momentum. That reduced interruption from wall contact can shave tenths off lap times on complex layouts.