24Z crown gear aluminium insert

The crown that makes a difference in competitive inline setups

The SIGI24-AL crown gear from Slot.it is part of the transmission range from one of the most demanding brands in the competitive slot racing world. With 24 teeth and an insert made of aluminium, this component is designed to provide stability, precision, and durability in inline motor configurations, where the motor is positioned perpendicular to the rear axle, favouring a lower centre of gravity and a more efficient weight distribution.

Technical specifications

• Number of teeth: 24Z
• Insert: aluminium
• Compatible axle diameter: 2.38 mm
• Application: inline motor
• Brand: Slot.it
• Reference: SIGI24-AL

Function and performance

The aluminium insert ensures a tight fit on the axle, reducing play that can occur with continued use. In competition, any unwanted movement in the transmission translates to loss of response and premature wear; aluminium minimises this risk compared to inserts made from softer materials. The crown gear transmits torque from the motor to the rear axle directly and efficiently, contributing to a cleaner and more predictable response on track.

Compatibility and installation

This crown gear is sized for 2.38 mm axles, a standard measurement in a wide variety of chassis and bases for Sport track slot cars. For proper installation, ensure that the axle is clean and free of burrs before inserting the crown. A well-executed fit prevents vibrations and noises that can adversely affect both performance and the durability of the transmission assembly.

When choosing the gear ratio, the 24-tooth crown is commonly paired with pinions of varying tooth counts depending on the circuit and the characteristics of the motor used. A longer ratio favours top speed on fast layouts, while a shorter ratio improves acceleration on technical circuits with many turns.

Common mistakes to avoid

• Do not force the crown onto the axle without first checking that the diameter is correct (2.38 mm). An axle of a different size compromises the fit and may damage the insert.
• Do not mix crown gears from different tooth systems with incompatible pinions: always verify that the module of the pinion and crown match.
• Regularly check the condition of the crown gear in competition cars, as wear on the teeth directly affects transmission efficiency.

Frequently asked questions

What type of motorisation is this crown gear intended for?

It is specifically designed for inline motor configurations, meaning those where the motor is aligned with the rear axle (perpendicular to it). It is not the usual option for sidewinder or anglewinder setups, although final compatibility always depends on the chassis and base used.

What advantage does the aluminium insert offer over other materials?

Aluminium provides greater rigidity and wear resistance at the contact point with the axle, maintaining a firm fit for a longer time. It is especially valued in intensive or competitive use, where transmission precision is critical.

What axles is the SIGI24-AL compatible with?

It is compatible with axles of 2.38 mm in diameter, which is the standard measurement indicated by Slot.it for this reference.

Do I need special tools to install it?

For optimal installation, it is recommended to use a crown gear puller and a suitable pusher, so that the crown gear is perfectly aligned and free of asymmetric tensions. Slot.it and other specialised brands like Sloting Plus offer specific tools for these operations.

How many teeth does it have and how does it influence the gear ratio?

It has 24 teeth. The final gear ratio depends on the pinion it is combined with. The greater the number of teeth on the crown compared to the pinion, the higher the top speed and lower the acceleration; the fewer the teeth, the more acceleration and lower the maximum speed. The correct choice depends on the layout and the motor used.

The Slot.it SIGI24-AL is a 24-tooth inline crown gear featuring an aluminium insert, designed for 2.38 mm axles. A precision component for competitive slot car builds, ensuring reliable power transfer and consistent performance on Sport-system tracks. Ideal for slot car racing enthusiasts looking for high-quality transmission parts from one of the most respected brands in the hobby.