24Z crown gear bronze insert

The inline crown gear reference: 24 teeth, bronze insert and precise fit on 2.38 mm axle

The 24Z inline crown gear with bronze insert from Slot.it (ref. SIGI24-BZ) is a transmission component specifically designed for setups with the motor in an inline position, meaning the motor is arranged longitudinally with respect to the rear axle, aligned with the chassis. This configuration places the driving mass more centrally and lower, which directly influences the car's behaviour in corners.

Main features

• 24 teeth (24Z): balanced tooth design, suitable for a wide variety of pinions, allowing adjustment of the gear ratio according to the type of track and the needs of each driver.
• Bronze insert: the bronze core ensures a firm fit on the axle and reduces wear from friction, prolonging the lifespan of the component and maintaining concentricity over time.
• For 2.38 mm axle: standard size in most Slot.it setups and compatible with Sport track chassis.
• Designed for inline motor: specific geometry for longitudinal setups, where the motor is aligned with the rear axle of the car.

Function and performance

The bronze insert makes a difference compared to pure plastic crowns: the coupling to the axle is more solid, better resisting high-frequency vibrations generated by competition motors and maintaining alignment with the pinion even after long running sessions. The result is a cleaner transmission, with less power loss and more predictable and uniform wear.

With 24 teeth, this crown gear is positioned in a medium-long gear ratio range, making it especially useful on tracks with long straights or when seeking top speed without sacrificing too much acceleration.

Compatibility and installation

This crown gear is designed for inline setups with a rear axle of 2.38 mm, the usual diameter in Slot.it transmission sets for Sport track. Before installation, it is advisable to verify that the motor pinion is compatible with the tooth module of this crown to ensure correct engagement and no play.

The installation is straightforward: the bronze insert is pressed onto the axle with the appropriate tool, without the need for adhesives. It is recommended to check the lateral alignment between the crown and pinion once installed, to avoid asymmetrical wear and transmission noise.

Common mistakes

• Installing an inline crown on a sidewinder or anglewinder chassis: the gear engagement geometry is not the same and performance is compromised.
• Not checking the axle diameter before installation: an oversized bronze insert may be loose; an undersized one may damage the axle when pressed.
• Combining this crown with a pinion of a different module: the teeth will not engage correctly and will accelerate the wear of both components.

Frequently asked questions

What is the difference between a crown with a bronze insert and a standard plastic crown?

The bronze insert provides a firmer grip on the axle, reduces friction at the contact point, and increases the lifespan of the component. In high-power motors or long sessions, the difference in stability and wear is noticeable.

Is this crown exclusive for inline setups?

Yes. It is designed and optimised for motors in an inline position (longitudinal with respect to the rear axle). For sidewinder or anglewinder configurations, Slot.it has specific references available.

Which pinions is it compatible with?

Compatibility depends on the tooth module. We recommend consulting the Slot.it transmission table or contacting us to ensure that your motor pinion fits correctly with this 24-tooth crown.

Can I use it on Scalextric or Ninco track (universal track)?

The crown itself is an internal transmission component of the car and does not depend on the type of track. However, the complete transmission set (chassis, motor, axle, and crown) must be configured coherently. Check the chassis compatibility before choosing the reference.

Do I need any special tools to install it?

It is recommended to use a specific pressing tool for crowns and inserts, available in our preparation tools section. Avoid striking directly on the insert to prevent deformation or damage to the axle.

The Slot.it SIGI24-BZ is a 24-tooth inline crown gear with bronze insert, designed for longitudinal motor setups in 1/32 slot cars. Compatible with 2.38 mm rear axles, it delivers precise power transmission, reduced wear and consistent performance on Sport track layouts. A reliable upgrade or replacement part for club racers and performance-oriented hobbyists.