11t pinion. Steel for 2mm axle. ø6.0mm x 2.5mm

Scaleauto SC-1131B Steel Pinion: Precise Transmission for 2 mm Axle

The pinion is one of the most critical components in the transmission of any slot car: it connects the motor to the crown gear and directly influences the gear ratio, acceleration response, and durability of the drivetrain. This SC-1131B from Scaleauto offers exactly what you need in a competition or tuning pinion: machined steel, specific dimensions, and direct compatibility with standard 2 mm axles.

Technical Specifications

• Reference: SC-1131B
• Number of Teeth: 11
• Material: Steel
• Inner Diameter (Axle): 2 mm
• Outer Diameter: 6.0 mm
• Width: 2.5 mm

Function and Performance

With 11 teeth, this pinion is designed for transmission setups that seek higher top speed compared to configurations with greater torque. Combined with crown gears of different tooth counts, it allows for adjusting the gear ratio to suit the track and the motor used. Being made of steel, it withstands friction and wear perfectly during long running sessions, both in recreational use and in club competition-oriented setups.

The fit on the 2 mm axle is precise, minimising play and ensuring a clean transmission of power from the motor to the crown gear. Any play in the pinion translates to a loss of efficiency and accelerated wear of the crown gear, so using a part of the correct dimensions makes a long-term difference.

Compatibility

This pinion is compatible with any motor-axle set that uses 2 mm diameter axles and crown gears with a module suitable for this pinion's pitch. It is a common reference in Scaleauto car setups, although its use can extend to any slot assembly that meets the specified axle dimensions. Always check the module of your crown gear before combining transmission parts.

Installation and Preparation

For correct installation, ensure that the pinion is aligned with the crown gear without lateral tilts. A slight fixing point with metal adhesive or tightening the adjustment screw —depending on the motor mount design— will prevent the pinion from shifting during operation. It is advisable to periodically check the wear state of the pinion and crown gear, as both parts work together and should be replaced in coordination to maintain optimal meshing conditions.

Common Mistakes

• Combining pinion and crown gear of different modules: causes poor meshing, noise, and premature wear.
• Not checking alignment: an off-centre pinion relative to the crown gear generates vibrations and power loss.
• Replacing only the pinion without checking the crown gear: if the crown gear is worn, the new pinion will deteriorate quickly.

Frequently Asked Questions

Which crown gears is this pinion compatible with?

It is compatible with crown gears whose module matches that of this pinion. Scaleauto offers a wide range of crown gears designed to work with their steel pinions. Always check the module before combining parts from different references.

Is it suitable for competition or just for recreational use?

Its steel construction makes it perfectly valid for both uses. In club competition, where cars run for extended sessions, steel offers greater durability than plastic or brass pinions.

Can I use it on cars from other brands with a 2 mm axle?

Yes, as long as the car's axle is 2 mm in diameter and the crown gear it is combined with has the appropriate module. The dimensions determine compatibility, not the vehicle brand.

What gear ratio do I achieve with 11 teeth?

The ratio depends on the number of teeth of the crown gear you use. For example, an 11-tooth pinion with a 27-tooth crown gear offers a ratio of approximately 2.45:1. The greater the difference between crown and pinion, the higher the torque; the closer the values, the higher the top speed you will achieve.

Do I need special tools to install it?

No special tools are required. A pinion puller makes disassembly easier without damaging the axle, and it is advisable to have one if you frequently change the transmission.

The Scaleauto SC-1131B is an 11-tooth steel pinion gear designed for 2mm axles, featuring a 6.0mm outer diameter and 2.5mm width. A reliable and precise transmission component for slot car racing and club competition setups, compatible with any 2mm axle configuration using the correct crown gear module. Essential for tuning slot car drive ratios and ensuring smooth, efficient power transfer from motor to rear axle.