28Z crown gear bronze insert

The Slot.it 28-tooth crown gear with bronze insert for inline motor

The Slot.it SIGI28-BZ Crown is a transmission component specifically designed for setups with an inline motor — that is, with the motor arranged longitudinally, in line with the rear axle of the car. Its 28 teeth and bronze insert make it a solid choice for both club preparations and those looking to fine-tune the drivetrain of their slot cars to the maximum.

Main features

• 28 teeth for a balanced gear ratio.
• Bronze insert: a material that provides durability and reduces friction in contact with the axle.
• Axle diameter: 2.38 mm, standard measurement in the Slot.it range.
• Designed for inline motor: the motor perpendicular to the rear axle, oriented longitudinally.

Compatibility and application

This crown is intended for Slot.it chassis and kits that use an inline configuration. The bronze insert ensures a secure fit on the 2.38 mm axle without the premature wear that other materials may cause. If you are preparing or tuning a car for Sport track — the usual system in competition with Scaleauto or Slot.it track — this crown fits precisely into the transmission.

Assembly and preparation

Assembly is straightforward if you already have experience with Slot.it kits. The bronze insert allows for a firm grip on the axle without the need for adhesives, although many tuners opt for an additional retention point depending on the level of competition. Always check the alignment between pinion and crown before closing the chassis: a well-aligned transmission reduces vibrations and extends the lifespan of both components.

Common mistakes

• Installing an inline crown on a sidewinder chassis: the geometry of the drivetrain is different and the engagement will not be correct.
• Not checking the lateral play between crown and pinion, which can cause noise or loss of efficiency.
• Forcing the insert onto an incorrectly sized axle. Always confirm that the axle measures 2.38 mm before installing it.

Frequently asked questions

Is this crown suitable for sidewinder or anglewinder configurations?

No. The reference SIGI28-BZ is designed for inline motors, where the motor is positioned in line with the rear axle. For sidewinder or anglewinder configurations, there are specific references in the Slot.it range.

What advantage does the bronze insert offer over other materials?

Bronze has very low friction in contact with the steel of the axle, resulting in less wear and a smoother transmission. Additionally, it is a material that withstands the heat generated during long track sessions well.

Which pinions work best with it?

Slot.it offers a wide range of pinions compatible with this crown. The choice of the number of teeth on the pinion will determine the final gear ratio: more teeth on the pinion means higher top speed; fewer teeth mean more acceleration. The choice depends on the layout and the motor used.

Do I need special tools to install it?

It is not essential, although having a crown extractor and a tooth gap gauge makes the job much easier and prevents damage to the part during installation or removal.

The Slot.it SIGI28-BZ is a 28-tooth inline crown gear with a bronze insert, designed for 2.38 mm axles. A reliable and precise transmission component for slot car builders and club racers working with Sport track systems. Compatible with Slot.it inline chassis configurations, it delivers smooth and consistent power transfer for competitive and recreational slot racing alike.