9d pinion. Ergal. ø5.5mm for 2mm axle

When every tenth counts, the Scaleauto SC-1092E55 pinion in Ergal makes a difference in the transmission of your 1/32 slot car.

The pinion is one of those components that goes unnoticed until it is replaced with a higher quality one. Switching to a pinion made of Ergal — the high-strength aluminium alloy also used in aeronautics — is immediately noticeable: less rotational inertia, sharper acceleration, and more precise braking when releasing the trigger.

Function and performance

This 9-tooth pinion with a 5.5 mm outer diameter is designed for motors with a 2 mm axle. Its tooth ratio is oriented towards configurations that prioritise torque and corner exit on tracks with many chicanes or slow corners, where low-speed push is crucial.

The Ergal combines notable hardness with a weight significantly lower than that of conventional steel pinions. By reducing the mass at the point closest to the motor shaft, a more direct response is achieved: the car accelerates sooner and, when the throttle is cut, the deceleration is also cleaner. In GT or Classic categories, where fine-tuning can determine grid positions, this type of detail has a real impact.

Compatibility and assembly

The SC-1092E55 is press-on mounted onto 2 mm axles, the most common standard in 1/32 slot racing motors. Before pressing it on, it is advisable to clean the axle with a dry cloth to remove any grease or dirt that could compromise the fit. A well-seated assembly ensures the concentricity of the pinion and prevents vibrations that accelerate the wear of the crown gear.

Combined with the appropriate crown gear — respecting the module of your car's transmission system — this pinion operates at a very low noise level thanks to its high-precision machining.

Preparation and common mistakes

• Always check the module of the crown gear before choosing the pinion: an incompatible module causes premature wear even if the number of teeth is correct.
• Use a removal tool or appropriate mounting fixture when pressing the pinion: direct force with pliers can deform the teeth.
• Check the axial play after assembly. If the pinion rubs against the body or chassis, adjust its position before tightening.
• Despite its high strength, Ergal is not as hard as steel. On tracks with sand or abrasive dirt, the lifespan may be reduced: check the pinion periodically.

Frequently asked questions

What scale is this pinion designed for?

It is designed for slot cars in 1/32 scale, the most common format in club racing and home use.

What real advantage does Ergal offer over a plastic or steel pinion?

Compared to plastic, Ergal offers greater durability and dimensional accuracy. Compared to steel, its main advantage is weight: being lighter reduces rotational inertia and improves acceleration and deceleration response.

Is it compatible with any 2 mm axle motor?

Yes, as long as the motor has a 2 mm diameter axle. However, remember to also check that the module of the pinion matches that of the crown gear you use in your transmission.

How many pinions are included in the package?

The provided information does not specify the number of units per package. Please check the product sheet in-store or contact us to confirm before placing your order.

In which competition categories is it most recommended?

It is particularly useful in GT and Classic categories, where fine-tuning of the transmission makes a difference. It is also a good choice for any driver looking to reduce rotational weight in their setup.

Do I need any special tools to mount it?

It is recommended to use a pressure tool (pinion press or similar) to ensure a concentric fit without damaging the teeth. Avoid using pliers directly on the pinion.

The Scaleauto SC-1092E55 is a 9-tooth Ergal pinion gear, 5.5 mm outer diameter, designed for slot car motors with a 2 mm axle. Crafted from high-strength aluminium alloy, it delivers reduced rotational inertia, sharper acceleration and cleaner engine braking — a go-to upgrade for 1/32 scale slot car racing in GT and Classic categories. Precision-machined for quiet, long-lasting meshing with the crown gear.