Crown gear in line 27z

27-tooth inline crown gear for 2.38 mm axle: precise transmission in longitudinal configuration

The AV20634 crown gear from Avant Slot is specifically designed for inline setups, meaning those where the motor is aligned with the rear axle —perpendicular to that axle— allowing for a lower centre of gravity and increased stability in corners. With 27 teeth and a pitch adapted for 2.38 mm axles, it fits directly into standard Avant Slot preparation configurations without the need for additional modifications.

The anchoring is done using a M2.5 screw, which is included in the package, so you can proceed with the assembly immediately.

Main features

• Number of teeth: 27z
• Mounting type: Inline (longitudinal motor, in line with the car)
• Compatible axle diameter: 2.38 mm
• Anchoring system: M2.5 screw (included)
• Brand: Avant Slot
• Reference: AV20634

Function and performance

The crown gear is one of the most critical transmission elements in a prepared slot car. Its number of teeth, in combination with the motor pinion, determines the final gear ratio: more teeth on the crown implies a longer ratio, with higher top speed but lower acceleration, while fewer teeth offer the opposite effect. With 27 teeth, this crown provides a versatile balance point, suitable for a wide variety of circuits and motor combinations.

The inline configuration, unlike the sidewinder or anglewinder, positions the motor longitudinally within the chassis. This favours a more centred and lower mass distribution, resulting in greater stability and predictability in the car's behaviour, especially on technical layouts with chicanes and variable radius corners.

Assembly and preparation

Assembly is straightforward: simply insert the crown onto the 2.38 mm axle and secure it with the included M2.5 screw. To ensure optimal operation, it is advisable to check the alignment between the crown and pinion before tightening the screw definitively, avoiding lateral play that could generate noise or premature wear. A light lubrication on the teeth with specific slot transmission lubricant will complete the setup.

Compatibilities

This crown is compatible with Avant Slot chassis that use inline configuration and a 2.38 mm rear axle. If you have doubts about compatibility with your specific model, we recommend consulting the technical sheet of the chassis or contacting us directly.

Common mistakes

• Confusing inline mounting with sidewinder: in inline, the motor is in line with the car (longitudinal), not transverse to the axle.
• Using a crown with a tooth pitch incompatible with the pinion: ensure that both share the same module.
• Not checking the crown-pinion alignment after assembly, which can cause vibrations and accelerated wear.

Frequently asked questions

What is the difference between an inline crown and a sidewinder crown?

The difference lies in the orientation of the motor. In an inline setup, the motor is positioned longitudinally (in line with the car's axle), and the crown is mounted accordingly to that geometry. In a sidewinder setup, the motor is parallel to the rear axle (transverse). Each type of crown is designed for its specific configuration and they are not interchangeable.

Is the M2.5 screw included?

Yes, the M2.5 screw necessary for anchoring the crown to the axle is included in the package.

Which pinions is this crown compatible with?

The crown must be combined with pinions of the same module (tooth pitch). We recommend checking the specification of your motor's pinion to ensure compatibility before mounting.

What gear ratio does the combination with a 9-tooth pinion offer?

With a 9-tooth pinion and this 27-tooth crown, the gear ratio would be 3:1. This is a common ratio for medium-high speed circuits, although the ideal ratio always depends on the motor, the circuit, and the type of tyre.

How do I know if this crown is suitable for my Avant Slot chassis?

The key detail is the diameter of the rear axle: if your chassis uses a 2.38 mm axle and has an inline configuration, this crown is compatible. If in doubt, consult us with your chassis reference and we will confirm compatibility.

The Avant Slot AV20634 is a 27-tooth inline crown gear designed for 2.38 mm axles, secured with an included M2.5 screw. An essential slot car spare part for inline motor setups, offering a reliable transmission solution for club racing and home circuit use. Compatible with Avant Slot inline chassis configurations. Key terms: inline crown gear slot car, 27 tooth crown gear, slot car transmission parts, Avant Slot spare parts, slot racing gear set.