Crown 33d. Sidewinder M50 ø16.5mm Procomp-RS Polyamide for axle 2.38mm and Screw M2.5

The Scaleauto SC-1164R Crown Gear: 33 Teeth M50 in Procomp-RS Polyamide for Demanding Sidewinder Setups

When adjusting the transmission of a slot car, every detail matters. This Scaleauto crown gear combines in a single piece the specifications that the most demanding tuners seek: 33 teeth, M50 module, outer diameter of 16.5 mm, Procomp-RS material, and direct compatibility with the standard 2.38 mm axle. All this with an included M2.5 screw for a clean and secure installation.

Technical Features

• Number of Teeth: 33
• Module: M50
• Outer Diameter: ø 16.5 mm
• Material: Procomp-RS polyamide
• Compatible Axle Diameter: 2.38 mm
• Included Fixing: M2.5 screw
• Motor Configuration: Sidewinder (motor parallel to the rear axle)

Function and Performance

Procomp-RS polyamide is the reference material in competition slot crown gears: it combines lightness with rigidity, absorbs some of the transmission vibrations, and offers very low wear even during long track sessions. With 33 teeth and M50 module, this crown gear allows fine-tuning of the transmission ratio towards a medium-high speed range, balancing acceleration and top speed depending on the pinion paired with it.

The diameter of 16.5 mm places it in a compact size, favourable for maintaining a low centre of gravity in the rear end, something particularly valued in cars with Sidewinder configuration where the motor is arranged parallel to the rear axle.

Compatibility

Designed for a 2.38 mm axle, the most widespread standard in the vast majority of 1/32 scale slot cars prepared for competition. Its fixing system using an M2.5 screw — already included — ensures that the crown does not migrate laterally under load, avoiding one of the most common problems in poorly adjusted transmissions.

It is especially suitable for chassis with the motor in Sidewinder position, both in Sport track cars and in other platforms that use this axle diameter.

Installation and Preparation

For correct installation, it is advisable to clean the axle with isopropyl alcohol before placing the crown, ensure that the plane of the crown is perfectly perpendicular to the axle, and tighten the M2.5 screw with the appropriate torque: enough to immobilise the part, without forcing the plastic. Once installed, check the clearance with the motor pinion: a minimal but perceptible play to the touch is a sign of a well-adjusted mesh.

If mounted on a new car or after a motor change, it is recommended to perform a progressive run-in so that the flanks of the teeth settle correctly and the transmission operates quietly and efficiently.

Common Mistakes

• Over-tightening the M2.5 screw, which can generate micro-cracks in the polyamide and misalign the crown.
• Mixing different modules: this crown is M50; the pinion must also be M50 for correct meshing.
• Ignoring the lateral alignment between crown and pinion, a common cause of premature wear and noise in the transmission.

Frequently Asked Questions

Is this crown suitable for any motor configuration?

It is specifically designed for Sidewinder setups, where the motor is arranged parallel to the rear axle. For Inline or Anglewinder configurations, other references should be considered based on the chassis geometry.

What pinion should I use with this crown?

It should be paired with a pinion of M50 module. The number of teeth on the pinion will determine the final transmission ratio; a lower number of teeth on the pinion results in greater multiplication and higher top speed, although with slightly less response in acceleration.

Can it be used on Scalextric and Scaleauto track systems?

The crown itself is independent of the track system: what determines compatibility is the axle diameter (2.38 mm) and the type of chassis. It can be used in cars prepared for any track system, as long as the axle is 2.38 mm and the configuration is Sidewinder.

Does the M2.5 screw come included as standard?

Yes, the SC-1164R reference includes the M2.5 screw for securing the crown to the axle.

What advantage does Procomp-RS polyamide offer over other materials?

Procomp-RS polyamide offers a good balance between lightness, mechanical strength, and vibration absorption capability. This translates into a smoother and quieter transmission, with less wear over time compared to stiffer or softer materials.

The Scaleauto SC-1164R is a 33-tooth M50 module crown gear for slot car Sidewinder setups, made from Procomp-RS polyamide. With an outer diameter of 16.5 mm and compatibility with the 2.38 mm axle standard, it delivers smooth and reliable power transmission for 1/32 scale competition slot cars. Includes M2.5 set screw for secure mounting. A precise, lightweight gearing solution for club racing and serious hobbyists.