Tamiya 15403 JR Double Aluminum Rollers 9-8mm - precision cornering upgrade for Mini 4WD  [15403]

Tamiya 15403 JR Double Aluminum Rollers 9-8mm - track focused upgrade

These Tamiya 15403 JR Double Aluminum Rollers (9-8mm) are a measured upgrade for Mini 4WD drivers who want tighter control through bends. The lower 9mm roller sits beneath the higher 8mm unit to fine tune the car's roll and lateral balance.

Purpose and Machine Fitment

Built to cut down on drag when the body touches the rail, the aluminum rollers help the car glide along walls with less speed loss. They fit standard Mini 4WD and Mini 4WD PRO chassis, so they slot into most builds without frame surgery.

How They Affect Race Performance

The staggered roller sizes help preserve velocity on twisty layouts by spreading contact points and reducing abrupt friction. On technical circuits this setup helps maintain corner exit speed and steady lap times.