13d pinion. Steel for 2mm axle. ø7.0mm x 2.5mm

Precision Transmission: the Scaleauto Steel Pinion for 2 mm Axle

The pinion is one of the most critical components in the transmission chain of a slot car. A poor pairing between pinion and crown gear can result in power loss, excessive noise, premature wear, and even breakage. Therefore, choosing a high-quality steel pinion — like this SC-1133B70 from Scaleauto — makes the difference between a car that runs smoothly and one that consumes energy inefficiently.

Technical Specifications

• Reference: SC-1133B70
• Number of Teeth: 13
• Material: Steel
• Axle Diameter: 2 mm
• Outer Diameter (ø): 7.0 mm
• Width: 2.5 mm

Function and Performance

With 13 teeth and an outer diameter of 7.0 mm, this pinion is aimed at configurations where a gear ratio that balances acceleration and top speed is sought. Being made of steel, it offers significantly higher wear resistance compared to plastic or nylon pinions, which is particularly relevant in long running sessions or club racing.

The width of 2.5 mm provides an adequate contact surface with the crown gear, promoting smooth transmission and minimising the risk of jumps or slips under load.

Compatibility and Installation

This pinion is designed for 2 mm axles, a standard measurement in a wide variety of slot car setups. It is essential to verify that the module of the pinion matches that of the crown gear to ensure proper meshing. Scaleauto offers a complete range of crown gears that these pinions are designed to work with.

For installation, it is recommended to use a specific pinion extraction and insertion tool to avoid damaging the teeth or forcing the axle. A correct tightening torque is equally important: too loose causes slipping, while too tight can bend the axle.

Common Mistakes

• Not verifying the module: A pinion with a different module than the crown gear will generate poor meshing even if the teeth appear to fit.
• Installing the pinion without centring: Minimal misalignments generate perceptible vibrations on track and asymmetric wear.
• Skipping lubrication: Although steel is durable, minimal lubrication at the pinion-crown contact point extends the lifespan of both parts.

Ideal for…

This pinion fits particularly well in preparation projects where 2 mm axles are used and there is a need to fine-tune the gear ratio to adapt to different layouts — whether they are fast circuits with long straights or technical ones with many tight corners. It is also a common choice as a preventive maintenance spare to keep the transmission in perfect condition.

Frequently Asked Questions

Which crown gears is this pinion compatible with?

It must be paired with a crown gear of the same module. Check Scaleauto's range of crown gears to ensure the module matches before installation.

Why choose a steel pinion over a plastic one?

Steel offers significantly higher wear resistance, especially in continuous use or competition. Plastic pinions may suffice for occasional recreational use, but steel guarantees greater durability and consistency in transmission.

Do I need any special tools to install it?

It is recommended to use a specific pinion extractor/inserter for slot cars. Forcing the pinion with pliers or other unsuitable tools can damage the teeth or deform the axle.

How many pinions are included in the package?

Check the product details or contact us to confirm the exact contents of the package, as it may vary depending on the sales format.

Is this pinion suitable for sidewinder and inline motorisation?

Yes, the type of motorisation does not affect the choice of the pinion itself, but rather its pairing with the corresponding crown gear for each transmission configuration.

The Scaleauto SC-1133B70 is a 13-tooth steel pinion gear designed for 2 mm axles, with an outer diameter of 7.0 mm and a width of 2.5 mm. A precision slot car transmission part ideal for club racing and home track use, compatible with Scaleauto's full range of crown gears. Available at Ministry of Hobby, your specialist slot car and scale modelling store in Spain.