30d red nylon inline crown gear with M2.5 screw

Scaleauto inline crown gear with 30 teeth in red nylon for 3/32 axle

The Scaleauto SC-1116R crown gear is a 30-tooth crown made of nylon, in its characteristic red version, designed for inline configurations and compatible with a 3/32 axle. The fixing is done using an M2.5 screw, ensuring a secure fit without play that could compromise the transmission during a race.

Function and performance

In an inline motorisation —where the motor is positioned longitudinally, in line with the rear axle of the car— the crown gear is the last link in the transmission and one of the factors that most influences the final gear ratio. With 30 teeth, this crown gear offers a balanced relationship between acceleration and top speed, suitable for both mixed club tracks and technical circuits with many curves.

Nylon as a material provides lightness, a reduced noise level during operation, and good absorption of micro-vibrations from the rear end. It is the most widely used material in competitive slot car crowns due to its balance between durability and weight.

Compatibility

This crown gear is designed for 3/32 axle (2.38 mm), the most common diameter in 1/32 scale slot cars. The M2.5 screw fixing allows for quick assembly and disassembly, especially useful when working with different gear ratios depending on the circuit.

Scaleauto designs its spare parts to fit with its own car platforms, although the combination of measurements —3/32 axle and M2.5 screw— is compatible with multiple chassis on the market. Always check compatibility with your specific chassis before assembly.

Assembly and preparation

• Insert the 3/32 axle into the crown gear hub to the desired position.
• Tighten the M2.5 screw with the appropriate Allen key, ensuring that the crown gear is perpendicular to the axle and without lateral play.
• Check the alignment with the motor pinion before final fixing: slight misalignment can cause premature wear or noise during operation.
• Check the tightness of the screw after the first running sessions.

Ideal for…

This spare part is particularly interesting for those preparing or tuning slot cars with inline motors and wanting to try different gear ratios depending on the layout. It is also useful as a preventive maintenance replacement in competition cars with intensive running.

Frequently asked questions

What is the difference between an inline configuration and a sidewinder?

In the inline configuration, the motor is placed longitudinally, in line with the rear axle, which allows lowering the car's centre of gravity. In the sidewinder, the motor is parallel to the rear axle (transverse). Each arrangement has its own specific crowns and pinions, so it is important not to interchange them.

Which pinions is this 30-tooth crown gear compatible with?

Compatibility depends on the module of your motor's pinion. Ensure that the module of the pinion and the crown gear match (usually module 0.5 in 1/32 slot) to guarantee correct meshing without play. Check the specifications of your motor and chassis.

Is nylon suitable for competition or just for recreational use?

Nylon is the standard material in 1/32 slot competition crowns. It offers a good balance between weight, durability, and quiet operation. Only in very specific high-power applications are crowns made from other materials used.

What gear ratio does a 30-tooth crown gear offer?

The gear ratio is calculated by dividing the teeth of the crown gear by those of the pinion. For example, with a 10-tooth pinion, the ratio would be 3:1. More teeth on the crown gear provide more torque and less top speed; fewer teeth provide more top speed and less acceleration.

Is any special tool required for assembly?

You only need an Allen key of the appropriate size for the M2.5 screw. No press or special tooling is required, making the change very quick in the pit during a running session.

The Scaleauto SC-1116R is a 30-tooth inline nylon crown gear in red, designed for 3/32 axle with M2.5 screw fixing. A reliable slot car transmission part for 1/32 scale inline setups, offering a balanced gear ratio suitable for both club racing and recreational use. Compatible with standard 3/32 axles and widely used in competitive slot car preparation.