30Z crown gear aluminium insert

The reference inline crown gear for precision transmissions: Slot.it SIGI30-AL

The SIGI30-AL crown gear from Slot.it is a transmission component specifically designed for setups with the motor in an inline configuration — that is, with the motor arranged longitudinally relative to the rear axle — a geometry that promotes a lower centre of gravity and improves the car's stability in corners. With 30 teeth and an insert made of aluminium, it offers an optimal combination of lightness and strength that makes a difference in demanding setups.

Main features

• Number of teeth: 30Z
• Insert: aluminium
• Compatible axle diameter: 2.38 mm
• Configuration: inline motor (longitudinal)
• Reference: SIGI30-AL

Function and performance

The aluminium insert of this crown gear is not a minor detail: the aluminium grips the axle firmly, minimising slippage and reducing play that can occur with continued use in conventional plastic crowns. The result is a cleaner transmission, with less power loss between the motor and rear axle.

With 30 teeth, this crown gear allows for adjusting the gear ratio by combining it with the appropriate pinion according to the needs of each track: higher torque for layouts with many curves or low speed, or a speed-torque balance for mixed tracks. It is a very versatile tooth count within the Slot.it catalogue, compatible with the brand's standard pinions.

Compatibility and installation

This crown gear is designed for 2.38 mm axles, the most common diameter in 1/32 scale competition setups. It is suitable for Slot.it rear groups with inline configuration and integrates seamlessly into chassis and mounts prepared for this type of motorisation. Before installing it, it is advisable to ensure that the axle is clean and free of burrs to guarantee a precise fit of the aluminium insert.

Common mistakes when installing crown gears with metal inserts

A common mistake is overtightening the grub screw on the aluminium insert: being a softer material than steel, it can deform if too much force is applied. Tighten firmly but without excess, and check the concentricity of the crown gear before closing the rear group. A small misalignment here results in vibration and premature wear.

Frequently asked questions

Why choose a crown gear with an aluminium insert over a plastic one?

The aluminium insert provides a more solid grip on the axle, reduces play, and extends the life of the crown gear. In long runs or regular competition, the difference in durability and consistency of the transmission is noticeable.

Which pinions is this 30-tooth crown gear compatible with?

It is compatible with the standard pinions from the Slot.it range for inline configuration. The choice of pinion tooth count will depend on the gear ratio you wish to achieve according to the track and motor.

Can I use this crown gear in a sidewinder or anglewinder configuration?

No: this crown gear is designed and optimised for inline motors. For sidewinder or anglewinder configurations, Slot.it has specific references with the appropriate geometry.

Is the 2.38 mm axle the most common in 1/32 slot cars?

Yes. The 2.38 mm diameter (equivalent to 3/32 inch) is the most widespread standard in 1/32 scale slot cars, both in stock setups and in competition preparations.

Do I need to lubricate the crown gear after installation?

A small amount of specific slot gear grease applied to the teeth of the crown gear improves operation and reduces wear. Do not apply excessively: the excess can end up on the braids or the track.

The Slot.it SIGI30-AL is a 30-tooth inline crown gear featuring an aluminium insert, designed for 2.38 mm axles and inline motor configurations in 1/32 scale slot cars. Its aluminium insert ensures a firm grip on the axle, reducing slippage and power loss for consistent, precise transmission. A reliable choice for club racing and competitive slot car preparation.