10t pinion, 6mm (x2)

Two 10-tooth pinions for 6 mm axle: total control over your transmission

The pinion is one of the most influential components of the drivetrain in a slot car. Changing the number of teeth or the axle diameter can completely transform the acceleration response, top speed, and behaviour in chicanes. This pack includes 2 10-tooth pinions designed for 6 mm axles, reference AV20615.

Function and performance

The pinion transmits the motor's rotation to the crown gear, directly determining the car's gear ratio. With 10 teeth, this pinion provides agile response and lively acceleration, especially useful on tracks with many curves or on indoor circuits where top speed is not the decisive factor. The 6 mm axle ensures a secure and play-free coupling to the motor.

Working with the correct pinion-crown ratio is key in preparing any car: too high a ratio can burn out the motor on long straights; too low a ratio will leave the car slow off the line. Having pinions of different sizes — like this 10-tooth one — allows for setup adjustments based on each track.

Compatibility and installation

This pinion is designed for 6 mm diameter axles. Always check the diameter of your motor's axle before purchasing, as it is the critical parameter for fitting. Also, ensure that the pinion's module is compatible with that of the crown gear you are using in your car, to ensure smooth engagement and no vibrations.

Installation is straightforward: place the pinion on the motor axle ensuring it is aligned with the crown gear and at the correct distance to avoid rubbing. A small fixing point or the tightening screw (depending on the type of pinion) will ensure it does not shift under load.

Common mistakes

• Not checking the module: a pinion and a crown gear must have the same module to mesh correctly. If the module does not match, wear will be premature and the engagement noisy.
• Over-tightening: a pinion that is too tight against the crown gear generates unnecessary friction and can increase the motor temperature.
• Forgetting to align: the pinion must be perfectly centred with respect to the crown gear to avoid vibrations and power loss.
• Not checking the axle: if the axle shows wear or is slightly bent, the pinion will not function accurately even if it is new.

Ideal for…

This pack of 2 pinions is especially useful for tuners looking to have spare parts on hand, for those making frequent setup adjustments between sessions, and for those competing in club championships where fine tuning makes a difference. It is also practical to have spare units in the drawer when working with several cars of the same axle configuration.

Frequently asked questions

How many pinions are included in this pack?

The AV20615 pack includes 2 10-tooth pinions for 6 mm axles.

How do I know if this pinion is compatible with my motor?

The determining factor is the diameter of the motor's axle. This pinion is designed for 6 mm axles. Measure your motor's axle with calipers before placing the order to ensure it fits.

What is the module of a pinion and why does it matter?

The module defines the size of the pinion's teeth. For the engagement with the crown gear to be correct, the pinion and crown gear must have the same module. If they do not match, the engagement will be poor and wear will be accelerated.

What gear ratio do I achieve with a 10-tooth pinion?

The gear ratio also depends on the number of teeth on the crown gear. You divide the teeth of the crown gear by those of the pinion: for example, with a 27-tooth crown gear and this 10-tooth pinion, you get a ratio of 2.7:1. A higher ratio gives more acceleration; a lower one gives more top speed.

Can I use this pinion in both sidewinder and inline configurations?

Yes, the type of configuration (sidewinder, inline, or anglewinder) does not affect the pinion's compatibility with the axle, as long as the axle diameter is 6 mm. What varies is the position of the motor relative to the rear axle, not the pinion itself.

Is it advisable to have spare pinions?

Definitely. Pinions are wear parts, especially in cars that are used frequently or in competition. Having a couple of spares like those in this pack allows for quick replacements without interrupting a tuning session or race day.

The AV20615 is a pack of two 10-tooth pinion gears for 6 mm motor axles, an essential slot car spare part for drivetrain tuning and setup. Whether you race on Scalextric, Scaleauto, Ninco or any other compatible track system, having the right pinion-to-crown ratio is key to optimising acceleration and top speed. A must-have spare for club racers, hobbyists and slot car preppers looking to fine-tune their transmission setup.