Crown gear in line 24z

24-Tooth Inline Crown Gear from Avant Slot: Precision on Every Lap

The 24z Inline Crown Gear (ref. AV20631) from Avant Slot is a transmission spare part designed for inline motor setups, meaning the motor is positioned longitudinally relative to the rear axle. This type of configuration lowers the car's centre of gravity, resulting in greater stability in corners and more predictable track behaviour.

Technical Specifications

• Number of Teeth: 24z
• Compatible Axle Diameter: 2.38 mm
• Fixing System: M2.5 screw (included in the package)
• Mounting Position: inline (motor in line with the rear axle)
• Reference: AV20631
• Manufacturer: Avant Slot

Function and Performance

The crown gear is one of the most critical transmission elements in any slot car. A 24-tooth crown offers a balanced gear ratio: sufficient acceleration out of corners without sacrificing top speed, making it suitable for both short, technical circuits and faster layouts.

The fixing with an M2.5 screw ensures that the crown does not shift on the axle during the race, which is especially important in inline setups where traction forces act directly and continuously.

Compatibility and Installation

This crown is designed for 2.38 mm axles, a standard size in many prepared slot cars. It is compatible with inline setups where the motor pinion transmits motion directly to the crown on the rear axle. To complete the transmission correctly, ensure that the pinion module matches that of this crown before installation.

The included M2.5 screw simplifies the installation process and ensures you do not need to search for additional hardware. Nevertheless, we recommend checking the tightness after the first running sessions to ensure everything remains in position.

Common Mistakes

• Installing a crown with a different module than the pinion: causes premature wear and excessive noise.
• Not checking the axial alignment between pinion and crown before tightening the fixing screw.
• Over-tightening the M2.5 screw, which can deform the crown or damage the axle.
• Confusing an inline setup with a sidewinder: in the inline setup, the motor is perpendicular to the axle, while in the sidewinder, it is parallel.

Frequently Asked Questions

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

The difference lies in the orientation of the motor relative to the rear axle. In an inline setup, the motor is longitudinal (in line with the car), so the crown is mounted directly on the rear axle and receives the pinion's rotation perpendicularly. In a sidewinder setup, the motor is transverse to the axle. The crowns themselves may be physically similar, but their position and working angle vary according to the chassis configuration.

Is the M2.5 screw included?

Yes, Avant Slot includes the necessary M2.5 screw to secure the crown to the axle, so you do not need to purchase it separately.

Which axles is this crown compatible with?

This crown is designed for 2.38 mm axles, which is one of the most common sizes in prepared and club racing slot cars.

Can I use this crown on any chassis with inline motorisation?

In principle, yes, as long as the rear axle is 2.38 mm and the motor pinion has the same module as this crown. Verify both specifications before installation to avoid transmission issues.

How many teeth is recommended to use according to the circuit?

A 24-tooth crown offers a balance between acceleration and top speed. For very technical and slow circuits, a crown with more teeth may be beneficial (more acceleration); for fast and long tracks, a crown with fewer teeth (more top speed). The 24z is a common starting point for adjustments based on track performance.

The Avant Slot AV20631 is a 24-tooth inline crown gear designed for 2.38 mm axles, secured with an included M2.5 screw. An essential transmission spare for slot car builders working with inline motor configurations, offering a reliable and precise fit for club racing and competitive setups.