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The rear stay (Japanese: リヤステー, Riyasutē) is the rear part of the Mini 4WD car's chassis.

How the rear stay work

In eariler days of MIni 4WD racing, the rear wheels is always touching the fences during cornering, thus slowing down the car. The rear stay's function is to keep the rear wheels from touching the fences. In addition, being installed with the rollers, the rear stay is also provide smoother cornering.

In most Mini 4WD car's setups, the rear stay is usually installed with two pairs of rollers (One on the upper sides and one on the lower sides.). This is because having two pairs of rollers on the rear stay will provide better stability, especially during wave sections and lane-change sections.

Newer chassis like Super-II Chassis, AR Chassis, MA Chassis and FM-A Chassis had their rear stay extended.

Breakage and reinforcing the rear stay

As the car was tunes faster, the rear stay might not able to withstands the impacts and will eventually breaks apart. This is where the reinforced plates and shock absorb parts comes to play; those parts are used to strengthen the rear stay, extend it and in some parts, absorbs the impacts. Extending the rear stay will also lessen the impacts it receives, which in turns increases the car's acceleration and stability.

Advance-user setups

Racer will usually have to remove and/or cut off the rear stay for the bumperless setups.

Where to get the rear stay

The rear stay is usually optional (Either Grade-up Parts or kit-included) on most Mini 4WD chassis.

Some chassis, notably Truckin' Chassis, MS Chassis (with either T-01 and T-04 tail units equipped), AR Chassis, MA Chassis, have the rear stay being part of the main chassis frame and is not removable.