12t steel pinion 6.5mm

12-Tooth Steel Pinion for 6.5 mm Transmissions: Small Component, Big Impact on Transmission

In slot racing, the transmission is one of the most critical links in the mechanical assembly. A worn, poorly sized, or excessively loose pinion directly translates to loss of traction, noise, and irregular car response. This steel pinion with 12 teeth and a 6.5 mm pitch (ref. MB-19261) meets that need with a component made from steel, a material that ensures greater durability compared to standard plastic pinions and a cleaner, more efficient transfer of torque.

Main Features

• Material: steel, with greater wear resistance than nylon or technical plastic.
• Number of Teeth: 12z.
• Transmission Pitch: 6.5 mm.
• Reference: MB-19261.

Function and Performance

The pinion is the part that connects the motor shaft with the crown gear, completing the transmission cycle. With 12 teeth, it offers a gear ratio that balances acceleration and top speed depending on the crown gear it is paired with. Being made of steel, the meshing with the crown gear is more precise, and wear is distributed more evenly over time, extending the lifespan of the assembly.

The 6.5 mm pitch determines compatibility with the crown gear: it is essential to verify that both parts share the same module before assembly to avoid play or interference that could harm the transmission.

Assembly and Preparation

The assembly of this pinion follows the usual process in slot preparation: fitting to the motor shaft with the correct inner diameter, precise alignment with the crown gear to avoid lateral rubbing, and checking the play between teeth before closing the chassis. A small error in alignment can result in vibration, excessive motor heating, or premature wear of both parts.

We recommend periodically checking the condition of the pinion, especially during intensive running sessions or in cars with inline configuration, where the transmission operates under different angles and loads compared to a sidewinder configuration.

Compatibility

This pinion is designed for transmissions with a 6.5 mm pitch. To confirm exact compatibility with your motor and crown gear, consult the manufacturer's specifications or contact our technical team.

Common Errors

• Combining pinion and crown gear with different pitches: although they may fit physically, wear will be premature and the transmission noisy.
• Over-tightening the pinion on the shaft, which can create marks that hinder future changes.
• Not checking the lateral alignment between pinion and crown gear before running.

Frequently Asked Questions

What does "12z" mean on a pinion?

"12z" indicates that the pinion has 12 teeth (from the German Zähne, teeth). This number, along with the number of teeth on the crown gear, defines the gear ratio of the car.

What gear ratio do I get with this pinion?

It depends on the crown gear you pair it with. For example, with a 24-tooth crown gear, you get a 2:1 ratio; with a 36-tooth crown gear, a 3:1 ratio, which is shorter and offers greater acceleration. Choose according to the track layout and motor power.

Why choose a steel pinion over a nylon one?

Steel offers greater durability and precision in meshing, especially in competition cars or those with high-power motors. Nylon may absorb vibrations better, but it wears out faster under high load.

Is this pinion compatible with any slot motor?

Compatibility depends on the diameter of the motor shaft and the transmission pitch. Always confirm that the inner diameter of the pinion matches your motor shaft before installation.

How often should I check or change the pinion?

In recreational use, the lifespan is long. In competition or intensive running, it is advisable to visually inspect it every few sessions to detect wear on the tooth flanks or excessive play with the crown gear.

The MB-19261 is a 12-tooth steel pinion gear for 6.5 mm pitch slot car transmissions, offering enhanced durability and precise meshing for competitive and recreational slot racing. A reliable upgrade over standard plastic pinions, compatible with a wide range of slot car motors requiring a 6.5 mm drive system.

Unconfirmed Information

We have not been able to verify the exact inner diameter of the pinion or the complete list of compatible motors. We recommend consulting the official technical sheet of MB or contacting our team before placing an order if you have doubts about compatibility with your specific motor.