12t pinion. Steel for 2mm axle. ø6.5mm x 2.5mm

Transmission with character: the Scaleauto steel pinion for 2 mm axle that makes a difference on track

In the mechanics of a slot car, the transmission is one of the points where the most is gained or lost. A worn, poorly adjusted pinion or one made with poor tolerances translates directly into power loss, vibration, and ultimately, seconds slipping away per lap. The Scaleauto SC-1132B65 pinion is made of steel to provide a long lifespan and a clean transmission from the very first moment.

Features and technical specifications

• Reference: SC-1132B65
• Number of teeth: 12
• Material: Steel
• Inner diameter (axle): 2 mm
• Outer diameter: ø6.5 mm
• Width: 2.5 mm

The dimensions are designed to fit precisely on 2 mm axles, one of the most widespread standards in the preparation of competition and street slot cars.

Function and performance

The pinion is the gear that, attached to the motor shaft, transmits the rotation to the crown gear and, from there, to the drive axle. With 12 teeth and an outer diameter of 6.5 mm, this Scaleauto pinion is designed for gear ratios that combine good acceleration with respectable top speed, depending on the crown gear it is paired with.

The choice of steel as a material is not accidental: compared to brass or plastic pinions, steel withstands continuous wear better, maintains dimensional tolerances for longer, and easily endures the temperatures generated during an intense running session. The result is a quieter transmission, with less play and greater energy efficiency.

Compatibility and installation

This pinion is designed for 2 mm diameter axles, a common measurement in many competition slot car setups. Before installing it, it is advisable to check:

• That the motor shaft has exactly a 2 mm diameter.
• That the crown gear it is paired with has a compatible module to achieve smooth engagement without excessive play.
• The distance between centres of the motor group and drive axle, to correctly adjust the engagement depth.

The adjustment of the pinion to the axle is usually done with a set screw or by press fit, depending on the chassis design. We recommend checking the lateral play and engagement depth after each installation to ensure maximum efficiency.

Common mistakes when working with pinions

• Excessive tightening of the set screw: can deform the axle or mark the pinion, causing vibrations.
• Too forced engagement with the crown gear: increases rolling resistance and generates unnecessary heat.
• Engagement with too much play: produces noise, premature wear, and power loss.
• Not checking lateral alignment: the pinion and crown gear must be perfectly aligned to avoid uneven wear.

Ideal for…

This pinion perfectly meets the needs of enthusiasts who prepare or tune their slot cars rigorously: from the club racer looking to squeeze every tenth to the enthusiast who frequently assembles and disassembles their vehicle and needs durable components that won’t let them down in a race.

Frequently asked questions

Which crown gears is this pinion compatible with?

It is compatible with crown gears that share the same tooth module. Scaleauto has a wide catalogue of crown gears; we recommend checking the module specifications of each piece to ensure correct engagement.

Is it necessary to lubricate the pinion?

A light lubrication at the contact point with the crown gear helps reduce wear and noise. Always use a minimal amount of specific slot gear lubricant; excess attracts dirt and can contaminate the track.

When should I change the pinion?

When excessive play in the engagement, unusual noise in the transmission, or visible wear on the tooth flanks is detected. In competition, checking it periodically is part of routine maintenance.

Can I use this pinion with motors from other brands?

Yes, as long as the motor shaft is 2 mm in diameter. The pinion is a universal part in that sense; what matters is the axle measurement, not the motor brand.

What gear ratio do I get with this 12-tooth pinion?

The gear ratio depends on the number of teeth of the crown gear. For example, paired with a 36-tooth crown gear, the ratio would be 3:1. A higher ratio means more acceleration and lower top speed; a lower ratio, the opposite.

The Scaleauto SC-1132B65 is a 12-tooth steel pinion gear designed for 2 mm motor shafts, featuring a 6.5 mm outer diameter and 2.5 mm width. Built for slot car competition and tuning, this precision steel pinion ensures reliable power transmission, long-lasting durability, and consistent meshing with compatible crown gears. An essential upgrade or replacement part for any serious slot car builder looking for accurate, low-maintenance drivetrain components.