14t pinion. Steel for 2mm axle. ø7.50m x 2.5mm

The Scaleauto steel pinion: robustness and precision in every transmission

When your slot car's transmission system fails, it is rarely due to the motor or electronics: often the culprit is a worn or poorly adjusted pinion. The Scaleauto 14-tooth Pinion SC-1124b75, made of steel, addresses this problem at its root with high-precision machining and a material that withstands intense racing sessions without showing wear.

Function and performance

This 14-tooth pinion is designed to fit on 2mm shafts, with an outer diameter of 7.50mm and a width of 2.5mm. Its steel construction clearly distinguishes it from plastic or nylon equivalents: the tooth mesh remains stable over time, torque transmission is direct, and power losses due to flexing or deformation of the pinion are virtually eliminated.

The number of teeth —14— defines a gear ratio that, in combination with the corresponding crown gear, allows fine-tuning of the top speed or torque output according to the needs of each track. A higher number of teeth on the pinion for the same number of teeth on the crown gear results in higher top speed and lower starting torque. Understanding this parameter is key when preparing the car for fast layouts with long straights.

Compatibility and installation

Designed for a 2mm shaft, it fits most slot car motor configurations in 1/32 scale that use that shaft diameter, whether in inline, sidewinder, or anglewinder setups. Before installation, it is advisable to verify:

• That the motor shaft is indeed 2mm in diameter.
• That the crown gear it pairs with has a compatible module with this pinion.
• The mesh (distance between pinion and crown gear): neither too tight —which generates heat and wear— nor too loose —which causes skipping and noise—.

To securely attach the pinion to the shaft, it is common to combine a press fit with a small amount of shaft adhesive. If the pinion is loose on the shaft, any low-strength shaft adhesive will suffice to secure it without hindering future disassembly.

Common mistakes when working with steel pinions

• Over-tightening against the crown gear: steel does not forgive; a zero mesh generates premature wear on both the pinion and the crown gear, especially if the latter is plastic or nylon.
• Not checking lateral alignment: the pinion and crown gear must be in the same plane. A misalignment of tenths of a millimetre results in vibrations and noise.
• Mixing incompatible modules: always ensure that the module of the pinion and that of the crown gear are the same. It is not enough for the teeth to fit at first glance.

Ideal for…

This pinion is particularly suitable for club racers and enthusiasts seeking durability and consistency in their drivetrain, without the need to frequently check or replace the pinion. It is also a very practical option for tuners who want to have a reliable stock of spare parts at a reasonable cost.

Frequently asked questions

What scale is this pinion designed for?

It is listed in the 1/32 Spare Parts section of Scaleauto, so its primary use is in 1/32 scale slot cars. However, final compatibility always depends on the shaft diameter (2mm) and the module of the pinion relative to the crown gear used.

What advantage does a steel pinion have over one made of plastic or nylon?

Steel offers greater wear resistance, maintains tooth geometry under load, and better withstands heat generated during long sessions. The downside is that if paired with a soft crown gear, it may wear it out faster: it is essential to ensure that the mesh is well adjusted.

Is this pinion suitable for any type of motor mounting (inline, sidewinder, anglewinder)?

Yes, the type of mounting does not affect the validity of the pinion. What determines compatibility is the shaft diameter (2mm) and the module. The pinion is valid for all three types of configuration as long as those parameters are met.

How do the 14 teeth influence the car's behaviour?

With 14 teeth and combined with the appropriate crown gear, a gear ratio that favours top speed is achieved. If more torque output is desired (useful on technical circuits or those with many curves), it is common to reduce the number of teeth on the pinion or increase that of the crown gear.

Do I need special tools to mount this pinion?

A pinion puller and a small shaft press greatly facilitate installation and prevent damage to both the pinion and the motor. It is not strictly essential, but highly recommended for a clean and risk-free fit.

The Scaleauto SC-1124b75 is a 14-tooth steel pinion gear for 2mm motor shafts, featuring a 7.50mm outer diameter and 2.5mm width. Designed for 1/32 scale slot car racing, this precision-machined steel gear delivers consistent power transmission, excellent wear resistance, and long-lasting performance across inline, sidewinder, and anglewinder motor configurations. A reliable replacement part for club racers and serious hobbyists seeking durable drivetrain components.