AW RT3 Motor Mount Offset 0.0mm hard (red)

The SC-6542 is the anglewinder motor mount from Scaleauto designed for those who do not tolerate flex or loss of geometry on track

Within the Scaleauto spare parts catalogue for the RT3 chassis, this motor mount in Hard version —identifiable by its red finish— occupies the highest rigidity end of the range. Its function is to keep the motor-rear axle assembly perfectly attached to the chassis, without yielding to the forces generated by neodymium magnets or high-revving motors in a real race.

Function and performance

The Hard hardness of this mount implies that the technical plastic used offers a resistance to deformation significantly superior to the Medium or Soft versions of the same family. In practice, this translates to:

• Stable geometry: the motor shaft and rear axle maintain their original alignment even during sudden accelerations or when passing over the braids in fast curve areas.
• Vibration elimination: the rigidity of the material better absorbs and dissipates the oscillations of the powertrain, reducing premature wear of pinion and crown gear.
• Linear traction response: the 0.0mm offset places the motor shaft centre aligned with the wheel axle centre, providing very predictable and easy-to-calibrate traction behaviour.

Compatibility

This mount is specifically designed for the Scaleauto RT3 chassis in anglewinder configuration —that is, with the motor positioned at an angle to the rear axle—. Before installing it, check that your chassis supports this type of mount and that the distance between the centres of your transmission is compatible with the 0.0mm offset.

Installation and preparation

The process of replacing the mount on an RT3 chassis is straightforward but requires attention to detail:

1. Remove the motor from the current mount by loosening the fixing screws.
2. Carefully extract the old mount from the chassis without forcing the anchoring points.
3. Place the SC-6542 in its position and secure it with the original or equivalent screws, tightening evenly to avoid introducing torsion.
4. Reinstall the motor and check the transmission play before the first track test.

Common mistakes

• Confusing hardness with universal behaviour: the Hard version is not always the best option. On tracks with high grip or low-power magnets, a softer mount may provide better absorption and less bouncing. Evaluate the conditions of your circuit.
• Not checking the required offset: the 0.0mm is a deliberate choice of geometry. If your transmission requires a different offset, this mount is not suitable.
• Over-tightening the fixing screws: the technical plastic, although rigid, can suffer micro-cracks if tightened beyond its tolerance. Adjust firmly, not with force.

Ideal for…

This mount is designed for club or championship competitors seeking maximum stability in the rear end, especially on Sport-rail tracks with high grip where mount flex becomes a variable that distorts tuning. If you have already fine-tuned the geometry of your RT3 and want to eliminate the last variable factor, the SC-6542 Hard is the logical step.

Frequently asked questions

What is the difference between the Hard (red) version and the softer versions of this mount?

The Hard version offers greater rigidity, which keeps the motor-axle geometry more stable under high loads. The softer versions allow for some controlled flex that, in certain track configurations, can improve the absorption of irregularities. The choice depends on the grip of the track and the power of the powertrain.

Is this mount compatible with all Scaleauto RT3 chassis?

It is specifically designed for the RT3 chassis in anglewinder configuration. If you have doubts about whether your specific version of RT3 supports this mount, consult the reference in the official Scaleauto catalogue or contact us before placing your order.

Is the 0.0mm offset the most common in competition?

The 0.0mm is one of the most used options due to its neutral and predictable behaviour, but the optimal choice depends on the gear ratio, crown and pinion diameter, and the type of track. Some drivers prefer positive or negative offsets to adjust the height of the motor shaft relative to the wheel axle.

Can I use this mount in a sidewinder or inline configuration?

No. This mount is designed exclusively for anglewinder configuration. It is not interchangeable with mounts for other motor arrangements.

Do I need special tools for installation?

No special tools are required. A screwdriver suitable for the fixing screw of the RT3 chassis is sufficient. We recommend checking the tension of the transmission after installation before running.

The Scaleauto SC-6542 is a hard-compound anglewinder motor mount for the RT3 chassis, featuring a 0.0mm offset for perfectly aligned and stable motor-to-axle geometry. Designed for 1/32 scale slot car competition, this red hard motor mount delivers maximum rigidity to eliminate flex under high-rpm motors and strong neodymium magnets. A precise upgrade for serious club racers seeking consistent traction response on Sport-rail circuits. Compatible with Scaleauto RT3 anglewinder chassis builds.