Crown gear in line 26z

26-Tooth Inline Crown Gear for 2.38 mm Axle — the Piece that Completes Your Transmission

The AV20633 crown gear from Avant Slot is designed for inline setups, meaning configurations where the motor is positioned longitudinally, in line with the rear axle of the car. This type of installation lowers the vehicle's centre of gravity and is common in high-performance competition models.

Technical Features

• Number of Teeth: 26z
• Compatible Axle Diameter: 2.38 mm
• Fixing System: M2.5 screw (included)
• Mounting Type: inline (longitudinal motor, in line with the rear axle)
• Reference: AV20633
• Brand: Avant Slot

Function and Performance

The crown gear is the gear that receives the motion from the pinion attached to the motor and transmits it to the rear axle to drive the wheels. A tooth count of 26 offers an interesting balance between traction and top speed: it is not an extremely short crown (which would provide high acceleration but limit speed) nor excessively long. It is a versatile choice for mixed circuits or for those seeking a balanced setup before fine-tuning the gear ratio.

The anchoring with an M2.5 screw ensures that the crown is perfectly centred and secured to the axle, without play that could cause vibration or premature wear. The inclusion of the screw is a practical detail appreciated in the workshop.

Compatibility and Installation

This crown is intended for axles with a 2.38 mm diameter, a widely used standard measurement in the competitive slot racing world. Before installing it, check that your motor's pinion is compatible in module with this crown. A module mismatch between pinion and crown leads to accelerated wear and loss of efficiency in the transmission.

Installation is straightforward: place the crown on the axle, align it correctly with respect to the pinion, and tighten the M2.5 screw with the appropriate Allen key. Do not overtighten to avoid deforming the axle or the crown itself.

Common Mistakes

• Mixing Different Modules: ensure that the pinion and crown share the same module. Otherwise, the engagement will be incorrect and wear will be premature.
• Not Checking Lateral Alignment: a misaligned crown with respect to the pinion generates noise, vibrations, and loss of power.
• Overtightening the M2.5 Screw: this can ovalise the housing. Tighten firmly but without forcing.
• Confusing Inline Mounting with Sidewinder: in a sidewinder setup, the motor is parallel to the axle; in an inline setup, it is perpendicular. This crown is designed for inline configurations.

Ideal for…

Preparers and enthusiasts who build or maintain slot cars with an inline configuration and a 2.38 mm rear axle. Also for those who need to replace the crown after wear or want to experiment with different gear ratios by adjusting the number of teeth on the crown or the motor's pinion.

Frequently Asked Questions

Is this crown compatible with sidewinder motors?

Not directly. This crown is designed for inline setups, where the motor is placed longitudinally with respect to the axle. In a sidewinder, the motor is parallel to the axle, and while the crown may be the same physical piece, you must verify that the alignment and module are compatible with your specific pinion.

What module does this crown have?

Avant Slot does not specify the module in the official description of this item. We recommend checking directly with us before combining it with a pinion from another brand to ensure that the engagement is correct.

Does the M2.5 screw come included?

Yes, as indicated in the official description, the M2.5 screw is included with the crown.

What axle diameter is it designed for?

It is designed for 2.38 mm axles, one of the most common measurements in competitive slot cars.

Can I use this crown to change the gear ratio of my car?

Yes. Changing the crown is one of the simplest ways to adjust the gear ratio. A crown with more teeth reduces top speed but improves acceleration; one with fewer teeth does the opposite. With 26 teeth, this crown offers a balanced starting point.

The Avant Slot AV20633 is a 26-tooth inline crown gear for 2.38 mm axles, secured with an included M2.5 screw. Designed for inline motor configurations in slot car racing, it provides a balanced transmission ratio suited to mixed-layout tracks. A reliable, direct-fit replacement crown for competitive slot car builders and enthusiasts looking to fine-tune their drivetrain setup.