Pulleys 9mm x2

Avant Slot 9mm Pulleys: Real Precision Belt Drive

Within the all-wheel drive system that characterises many Avant Slot models, the pulley is a silent yet decisive component. These 9mm pulleys (ref. AV20441) are part of the belt drive assembly that connects the motor to the front and rear axles, distributing power evenly and without sharp spikes.

Function and Performance

In slot cars with all-wheel drive —common in the rally and raid categories that Avant Slot meticulously works on— the belt drive directly depends on the geometry and condition of the pulleys. A diameter of 9mm dictates the final gear ratio: it influences the balance between launch acceleration and top speed, and any wear or eccentricity in the pulley translates into vibrations that the timer records mercilessly.

These pulleys are manufactured to fit precisely on the axle, eliminating play that could cause traction loss or premature belt wear. Replacing them preventively —especially after long competition sessions— is a common practice among tuners who fine-tune Avant Slot cars.

Compatibility and Installation

This set of 2 pulleys is designed for Avant Slot models that use a belt drive system with a 9mm pulley. If you have doubts about whether they fit your specific model, consult the official Avant Slot parts list or compare with the reference of your original pulley set before installing them.

The installation does not require special tools, but it is advisable to ensure that the fit on the axle is firm and without radial play. A small excess of play is enough for the belt to operate under unfavourable conditions and fail prematurely.

Installation and Preparation: Common Mistakes

• Not checking the belt tension after replacement: a new pulley may slightly alter the system's tension; adjust it before running.
• Reusing a heavily worn belt with new pulleys: if the belt has many laps, changing the pulleys is the ideal opportunity to renew it as well.
• Forcing the fit on the axle: if it is difficult to fit, check that the axle is clean and free of burrs before applying pressure.

Ideal for…

Tuners and enthusiasts competing with Avant Slot all-wheel drive models in rally or raid categories, who want to keep their cars in optimal tuning condition. Also for those restoring or maintaining their models in perfect working order.

Frequently Asked Questions

How many pulleys does this set include?

The AV20441 pack includes 2 pulleys of 9mm.

For which Avant Slot models are these pulleys intended?

They are designed for Avant Slot models that feature a belt drive with a 9mm pulley, common in their rally and raid lines. Check your model's parts list to confirm exact compatibility.

How often should they be replaced?

It depends on usage and track type. In regular competition, a visual inspection after each long session is sufficient. If you notice unusual vibrations or the belt shows asymmetric wear, it is a sign that the pulleys may be affected.

Should I also change the belt when installing new pulleys?

It is not mandatory, but if the belt has been used for many hours, taking advantage of the disassembly to renew it is a good practice that extends the life of the assembly.

Can they be used on cars from other brands?

They are an original spare part from Avant Slot, designed for their own models. Compatibility with cars from other brands will depend on whether they share the same pulley and axle diameter; always check this before installing.

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