14t pinion. Diameter 7.5mm. Ergal

Slot.it SIPI7514E: Ergal 14-tooth pinion for a more agile and precise transmission

Within the range of Ergal spare parts from Slot.it, the pinion SIPI7514E represents one of the most sought-after transmission components by tuners and competition drivers in the 1/32 category. Its combination of 14 teeth, a diameter of 7.5 mm, and Ergal material makes it a technically differentiated option compared to conventional brass pinions.

Function and performance

Ergal is a high-strength aluminium alloy —widely used in aerospace and competition— that offers a significantly superior strength-to-weight ratio compared to brass. When applied to a pinion, the direct result is a significant reduction in rotational mass on the motor shaft. Less inertia means a more immediate trigger response, livelier acceleration from the start of the straights, and greater braking capacity when releasing the trigger.

The 14-tooth gearing, combined with the 7.5 mm diameter, defines a gear ratio oriented towards circuits with fast sections or long straights, where developing top speed is advantageous. To fine-tune the setup, it will be sufficient to combine this pinion with crowns of different tooth counts until finding the ratio that best suits the layout and the motor used.

Compatibility and installation

Slot.it designs its Ergal pinions to work with the Sport track, the brand's standard system. Before installing the SIPI7514E, it is advisable to verify that the inner diameter of the pinion is compatible with your motor shaft, as well as ensuring that the tooth module matches the crown you have mounted. Slot.it's high-precision machining guarantees a clean contact between pinion and crown, which reduces friction, minimizes vibrations, and helps maintain the motor temperature within optimal ranges.

Installation is straightforward and does not require special tools beyond a suitable fixture or tooling to secure the axial position of the pinion on the shaft.

Common mistakes when choosing a pinion

• Confusing outer diameter with inner diameter: the 7.5 mm refers to the diameter of the pinion, not the shaft. Check the diameter of your motor shaft before ordering.
• Ignoring the tooth module: a Slot.it pinion must be combined with crowns of the same module for proper engagement and to avoid premature wear.
• Choosing the number of teeth solely for speed: a 14-tooth pinion offers a long gear ratio, but in technical circuits with many curves, it may penalize acceleration. Always adjust the ratio to the layout.

Frequently asked questions

What real advantage does Ergal have over brass in a pinion?

Ergal weighs considerably less than brass, which reduces inertia on the motor shaft. This translates into a more direct trigger response and a lower workload for the motor, which can positively influence its temperature and durability.

Which crowns is this pinion compatible with?

It must be combined with crowns of the same tooth module. Slot.it has a wide range of compatible crowns; consult the brand's transmission table to choose the ratio that best fits your setup and circuit.

Is it suitable for Sidewinder, Inline, and Anglewinder configurations?

Yes, the pinion itself is compatible with different motor layouts. The choice of the number of teeth and diameter will depend on the specific configuration of your chassis and the available space between the motor shaft and the crown.

How long does an Ergal pinion last with regular club use?

Ergal offers good surface hardness and withstands wear with high-torque motors. Durability also depends on the fit between pinion and crown and the lubrication used. With a well-adjusted engagement, the lifespan is significantly longer than that of softer materials.

Do I need any special tools to install it?

It is not essential, although having suitable fixture tooling makes it easier to position the pinion at the exact point on the shaft and avoid play or misalignments that could generate vibrations.

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