15d pinion. Steel for 2mm axle. ø8.0mm x 2.5mm

Steel Precision Transmission: the 15-tooth pinion from Scaleauto for 2 mm axle

When working on the transmission of a slot car, every tenth of a millimetre counts. This 15-tooth steel pinion designed by Scaleauto is aimed at enthusiasts who leave nothing to chance: from the preparer fine-tuning the club setup to the driver in competitive categories seeking the exact gear ratio.

Features and specifications

• Number of teeth: 15
• Material: steel
• Inner diameter (axle): 2 mm
• Outer diameter: ø 8.0 mm
• Width: 2.5 mm
• Reference: SC-1135b80
• Brand: Scaleauto

Function and performance

The pinion is the link between the motor shaft and the crown gear, and its quality directly affects the smoothness of the transmission, the wear of the assembly, and the final performance on track. The steel construction from Scaleauto ensures a significantly higher durability compared to plastic or zamak pinions, especially under intensive use or prolonged competition conditions.

With 15 teeth and an outer diameter of 8.0 mm, this pinion allows for configuring common gear ratios in competition setups, combined with the appropriate crown gear according to the type of chassis and the category being raced. The width of 2.5 mm ensures a sufficient contact surface for stable and quiet engagement.

Compatibility and installation

This pinion is designed for 2 mm diameter axles, a standard measurement in a wide variety of motors and transmission assemblies used in the slot car world. Before installation, it is advisable to check that the module of the pinion is compatible with that of the crown gear to be used, as combining different modules can lead to premature wear and loss of efficiency.

For a correct fit, it is recommended to check the clearance between the pinion and crown gear with the appropriate tool and ensure that the pinion is axially aligned with the crown gear before permanently securing the assembly.

Common mistakes when installing pinions

• Mixing pinion and crown gear of different modules: causes noise, accelerated wear, and loss of power.
• Over-tightening the securing screw on the axle, which can lead to deformation of the inner hole or misalignment of the pinion.
• Not checking the lateral alignment between pinion and crown gear, causing asymmetric wear.
• Reusing a worn pinion when changing the crown gear: both elements must be in good condition for optimal engagement.

Ideal for…

This pinion is the right choice for preparers and competitors working with 2 mm axle chassis who seek a durable steel component with the exact measurements required for a careful setup. It is also practical as a stock spare part for those maintaining several cars in simultaneous preparation.

Frequently asked questions

Which crown gears is this pinion compatible with?

It depends on the module. For correct engagement, the crown gear must have the same module as the pinion. Check the module specification in the technical data sheet of the crown gear you plan to use and ensure it matches that of this Scaleauto pinion.

Do I need any special tools to install it?

It is recommended to use a pinion puller or press to avoid damaging the axle or the pinion itself during installation and removal. Avoid striking directly on the parts.

Is it suitable for any motor with a 2 mm axle?

In principle, yes, as long as the module of the pinion is compatible with the rest of the transmission. The axle diameter (2 mm) is the reference measurement for the inner hole, but final compatibility also depends on the module and the geometry of the chassis.

How long does a steel pinion last compared to a plastic one?

Generally, steel offers a significantly longer lifespan under intensive use conditions. In competition or during long running sessions, the difference is particularly noticeable, as plastic and zamak tend to wear out or deform sooner.

Can I combine it with crown gears from other brands?

Yes, as long as the module is the same. The engagement system is standard, so the brand of the crown gear is not decisive; what matters is that the module matches exactly.

The Scaleauto SC-1135b80 is a 15-tooth steel pinion gear designed for 2 mm axles, with an outer diameter of 8.0 mm and a width of 2.5 mm. A precision-machined component for slot car transmission setups, compatible with standard 2 mm motor axles. Ideal for club racing, competition builds and serious hobbyists looking for durable, reliable drivetrain parts. Available at Ministry of Hobby.