Crown gear in line 29z

29-Tooth Inline Crown Gear for 2.38 mm Axle — Avant Slot Replacement AV20636

When we talk about adjusting the gear ratio in a car with inline motorization, the choice of crown gear is one of the factors that most influences track performance. This 29-tooth crown gear from Avant Slot is specifically designed for inline configurations — that is, those where the motor is positioned longitudinally, in line with the rear axle — offering a precise fit and clean transmission.

Technical Features

• Number of Teeth: 29z
• Axle Compatibility: 2.38 mm
• Mounting System: M2.5 screw (included)
• Configuration: inline (motor in line with the rear axle)
• Reference: AV20636
• Brand: Avant Slot

Function and Performance

The crown gear is the gear that receives the motion from the motor pinion and transmits it to the rear axle. With 29 teeth, it offers a gear ratio that balances acceleration and top speed, suitable for mixed track layouts. Avant Slot's manufacturing quality ensures a consistent tooth profile that minimizes vibrations and premature wear of the pinion.

The mounting system using the M2.5 screw — which is included in the pack — allows for secure installation and easy adjustment without special tools. This facilitates both initial assembly and ratio changes during preparation sessions.

Compatibility and Installation

This crown gear is designed for axles with a diameter of 2.38 mm, a widely used standard size in competitive slot cars. Before installation, it is advisable to verify that the car's axle has exactly that diameter and that the motor pinion is compatible with the module of this crown gear.

The installation is straightforward: place the crown gear on the axle, align it with the pinion leaving minimal play but without excessive slack, and tighten the included M2.5 screw. A good starting point is to leave a piece of paper between the crown and pinion to ensure smooth and quiet transmission.

Common Mistakes

• Over-tightening the M2.5 screw can cause deformation of the crown gear or difficulties in disassembly later. Tighten firmly, but without forcing.
• Mounting the crown gear misaligned with the pinion generates uneven wear and noise. Always check the visual alignment before concluding the installation.
• Confusing the inline system with sidewinder: remember that inline means longitudinal motor (in line with the axle), while sidewinder is transverse. Always use the appropriate crown gear for each configuration.

Ideal for…

This replacement part is aimed at enthusiasts and competitors working with inline slot cars who need to replace or change the crown gear to adjust the gear ratio. It is also useful for those building cars from scratch or making motorization conversions.

Frequently Asked Questions

Which pinions is this crown gear compatible with?

Avant Slot does not specify the exact module of this crown gear in the available data. We recommend checking with the pinions from the Avant Slot range or consulting compatibility before combining it with pinions from other manufacturers.

Is the M2.5 screw included?

Yes, according to the official product description, the M2.5 screw needed for mounting is included in the pack.

Can I use this crown gear on a sidewinder or anglewinder car?

This crown gear is designed for inline configurations. Although the axle may be the same diameter, the transmission geometry in sidewinder or anglewinder may require crown gears with a different profile or position. Always check compatibility with your specific configuration.

When should I change the crown gear?

It is common to replace it when visible wear on the teeth is observed, unusual noise in the transmission, or loss of traction without any apparent cause. It is also common to change it when modifying the gear ratio to adapt the car to a specific track.

Is any type of lubrication necessary?

A small amount of specific slot gear grease applied to the teeth of the crown gear improves the smoothness of the transmission and extends the lifespan of both the crown gear and the pinion. Avoid excesses that may contaminate the braids or the track.

The Avant Slot AV20636 is a 29-tooth inline crown gear for 2.38 mm axles, secured with an included M2.5 screw. Designed for inline slot car configurations, it delivers precise and reliable power transmission. A quality replacement part for competitive slot car racing and club-level preparation.