29Z crown gear bronze insert

The Slot.it inline crown gear with bronze insert: precise transmission, durable mounting

The SIGI29-BZ crown from Slot.it is part of its extensive family of plastic crown gears with a metal insert, specifically designed for setups with the motor in an inline position, meaning the motor is placed longitudinally to the rear axle. This arrangement allows for a lower centre of gravity for the car and optimises weight distribution, which is particularly valued in competition chassis.

Features and function

• 29 teeth: an intermediate number of teeth, widely used in balanced gear ratio combinations for a wide variety of tracks and motors.
• Bronze insert: the metal core provides greater wear resistance compared to pure plastic versions, improving the lifespan of the part and the fit on the axle.
• 2.38 mm axle: standard diameter widely used in the competitive slot universe, compatible with common rear axles in 1/32 scale.
• Inline configuration: designed for motors mounted inline with the rear axle (longitudinally), not for sidewinder or anglewinder configurations.

Compatibility and mounting

This crown is designed for use in Slot.it transmission systems with corresponding pinions. As it is an inline crown, the pinion that drives it is mounted directly on the motor shaft, which is perpendicular to the rear axle of the car. It is essential to verify that the pinion used has the appropriate module to ensure correct meshing and a transmission free from vibrations or play.

The bronze insert facilitates a firm fit on the 2.38 mm axle. It is recommended to carefully adjust the axial position to ensure perfect alignment with the motor pinion and avoid premature wear on both parts.

Track performance

With 29 teeth, this crown offers a gear ratio that balances acceleration and top speed depending on the chosen pinion. It is a very versatile option: when combined with 9 or 10-tooth pinions, it provides typical configurations for technical circuits with many curves, while with smaller pinions, it allows for fine-tuning the response on faster tracks. The bronze insert reduces friction losses and keeps the tooth engagement clean for longer than pure plastic.

Frequently asked questions

Is this crown suitable for sidewinder or anglewinder setups?

No. The SIGI29-BZ reference is specifically designed for inline configurations, where the motor is placed longitudinally to the rear axle. For sidewinder or anglewinder, Slot.it has specific references with different crown geometry.

What advantage does the bronze insert offer over a pure plastic crown?

The bronze insert significantly increases wear resistance in the contact area with the axle, improves the fit, and extends the lifespan of the crown, especially in intensive running sessions or club competitions.

Which pinions is it compatible with?

It is compatible with Slot.it pinions of the corresponding module. Refer to the Slot.it transmission table to identify the recommended pinion/crown combinations based on the motor and track type.

Can I use this crown on a sidewinder chassis by changing the motor position?

It is not recommended. The meshing geometry and the position of the pinion in an inline configuration are different from those of a sidewinder. Using the incorrect crown can lead to poor meshing, vibrations, or accelerated wear.

Is any adhesive needed to secure the crown to the axle?

The bronze insert allows for a firm fit by pressure. However, many preparers apply a minimal amount of specific slot axle adhesive to ensure that the crown does not shift under the load of the transmission. Follow the recommendations of your chassis manufacturer.

The Slot.it SIGI29-BZ is a 29-tooth inline crown gear with a bronze insert, designed for 2.38 mm axles. A reliable and durable slot car transmission part for 1/32 scale competitive and club racing. Compatible with Slot.it inline motor setups, this crown gear offers consistent meshing and extended wear life thanks to its metal insert. Ideal for slot car preparation, tuning, and performance upgrades.