Tamiya 3RACING M4WD-40/LB 19mm Lightweight Aluminum Ball Race Rollers - Light Blue  [M4WD-40/LB]

Quick look at the Tamiya 19mm ball race rollers

These Tamiya Mini 4WD 19mm Aluminum Ball Race Rollers in light blue are built to improve stability and handling on a range of track layouts. The ringless, lightweight design reduces rotating mass while keeping the part durable for regular racing use.

Construction and purpose

The 19mm aluminium ball rollers are ringless to lower weight without sacrificing strength. The light blue finish gives a neat visual upgrade. Their function is to stabilise the car through corners and reduce unwanted contact with walls.

Chassis fit and practical use

They fit common Mini 4WD chassis types such as MS, MA, AR, and VS and install with standard Mini 4WD tools. Swap them in for stock rollers to gain more consistent handling on both fast straights and technical sections.

Effect on lap times

Reduced mass helps acceleration and speed retention, which can shave tenths off lap times when combined with good setup. Lower friction and improved stability both contribute to a more controlled racing line.