12d brass pinion ø7.00mm for 2mm shaft

Precision Transmission: Scaleauto Brass Pinion for 2 mm Axle

When it comes to fine-tuning a slot car's transmission, details matter. The pinion is the link between the motor and the crown gear, and its quality directly affects the efficiency of the transmission, noise level, and durability of the assembly. The Scaleauto SC-1095A70 is a 12-tooth pinion made of brass, with a 7.00 mm outer diameter and designed to fit 2 mm axles.

Function and Performance

Brass is a commonly chosen material for competition pinions for several reasons: it offers precise machining, progressive and controlled wear, and works very well in combination with engineering plastic or steel crown gears. Its specific weight, slightly higher than plastic, contributes to a smoother transmission with less play.

With 12 teeth and ø7.00 mm, this pinion corresponds to a specific gear reduction configuration. The ratio between pinion and crown gear is one of the key parameters in tuning any slot car: properly adjusting this ratio allows for optimising acceleration, top speed, and cornering behaviour according to the track and type of competition.

Compatibility and Installation

This pinion is sized for 2 mm rear axles, a standard measurement in a wide variety of 1/32 and 1/24 scale slot car mechanics. It is particularly suitable for installations on cars prepared for Sport track (Scaleauto, Slot.it), although its use can extend to any mechanics that share the same axle specifications.

• Material: brass
• Number of teeth: 12
• Outer diameter: ø7.00 mm
• Compatible axle diameter: 2 mm
• Reference: SC-1095A70
• Brand: Scaleauto

For correct installation, it is essential to check the alignment between the pinion and crown gear and adjust the lateral play to the minimum possible without causing friction. A misaligned pair generates vibrations, loss of performance, and premature wear of both parts.

Installation and Preparation

The installation of this pinion on the axle is usually done by press fitting or with low-strength anaerobic adhesive (such as Loctite 222 or similar), depending on the type of axle and the level of adjustment. We recommend always checking that the pinion is perfectly perpendicular to the axle to avoid wobbling that reduces transmission efficiency.

Before putting the car on the track, it is advisable to run the transmission assembly for a few minutes at low speed to settle the engagement between the pinion and crown gear. This small step makes a noticeable difference in the smoothness of operation and the lifespan of the components.

Common Mistakes

• Combining pinions and crown gears of different modules: always verify that the module of the pinion matches that of the crown gear.
• Installing the pinion with excessive axial play, causing noise and power loss.
• Not checking the lateral alignment between the pinion and crown gear after each disassembly of the motor or axle.
• Using high-strength adhesives that complicate future disassembly without damaging the axle.

Ideal for...

This pinion is the right choice for tuners and competitors working with 2 mm axle mechanics who need to adjust their car's gear reduction. It is also very useful as a maintenance spare part to keep the transmission in optimal condition throughout the season.

Frequently Asked Questions

Which crown gears is this pinion compatible with?

Compatibility depends on the module of the pinion. It is essential to verify that the crown gear to be paired has the same module to ensure correct engagement. Scaleauto offers a wide range of crown gears that can be combined with this pinion.

Can I use this pinion in inline and sidewinder configurations?

Yes. The motor configuration (inline —motor in line with the rear axle— or sidewinder —motor transverse to the rear axle—) does not affect the use of the pinion, as long as the axle is 2 mm and the module of the crown gear is appropriate.

How do I secure the pinion to the axle?

The most common method is to use low-strength anaerobic adhesive to facilitate future disassembly. In some cases, press fitting is sufficient, although it is not the most recommended in competition, where vibrations can loosen the part.

Is it suitable for Scalextric or Ninco tracks (universal track)?

Yes, as long as the car's mechanics have a 2 mm axle. The type of track (Sport or universal) does not affect the choice of pinion, which depends exclusively on the dimensions of the axle and the module of the crown gear.

When should I replace the pinion?

When unusual noise is detected in the transmission, power loss without apparent cause in the motor, or visible wear on the flanks of the teeth. Periodic inspection of the pinion-crown gear assembly significantly extends the life of both parts.

The Scaleauto SC-1095A70 is a 12-tooth brass pinion gear with a 7.00 mm outer diameter, designed for 2 mm axles. A key slot car transmission component for 1/32 and 1/24 scale builds, compatible with inline and sidewinder motor configurations. Ideal for club racing, home circuit tuning and slot car preparation on Sport track systems.