32d Crown. Sidewinder M50 ø16.5mm Procomp-RS polyamide for Shaft 2.38mm and Screw M2.5

Sidewinder Transmission Crown Gear Reference for Slot Racing Competitions

The SC-1163R crown gear from Scaleauto is a 32-tooth transmission component specifically designed for Sidewinder configurations — that is, with the motor positioned parallel to the rear axle — featuring an outer diameter of ø16.5mm and made from Procomp-RS polyamide, Scaleauto's reference material for high-performance crown gears. It fits onto a 2.38mm axle and is secured with an M2.5 screw.

Technical Specifications

• Number of teeth: 32
• Outer diameter: ø16.5mm
• Material: Procomp-RS polyamide
• Compatible axle diameter: 2.38mm
• Fixing system: M2.5 screw
• Motor configuration: Sidewinder (motor parallel to rear axle)
• Reference: SC-1163R
• Brand: Scaleauto

Function and Performance

The crown gear is the final link in the transmission chain before the motion reaches the rear axle. Its 32-tooth design allows for fine-tuning the gear ratio by combining it with different pinions: more teeth on the crown implies greater traction and better cornering performance, while reducing teeth favours top speed. With a diameter of ø16.5mm, this component offers a solid balance between the two extremes, making it a common choice for mixed layout circuits.

The Procomp-RS polyamide from Scaleauto is noted for its wear resistance, low moisture absorption, and ability to maintain gear geometry even under intensive use conditions. Unlike metal crowns, it generates less noise during operation and is gentler on the motor pinion, extending the lifespan of the assembly.

Compatibility and Installation

This crown gear is designed to fit onto 2.38mm rear axles, a widely used measurement in most 1/32 scale slot racing chassis aimed at competition. The fixing with an M2.5 screw ensures a firm fit and facilitates quick crown changes during car preparation or between heats.

As a part of Scaleauto's Procomp-RS line, it is intended for setups where the precision of alignment between pinion and crown is critical. Always check the centre distance relative to the pinion you intend to pair it with, and ensure that the M2.5 screw is properly tightened before running.

Ideal for…

• Tuners and drivers looking to fine-tune the gear ratio in Sidewinder setups.
• Club competitors needing a reliable and quick-mount replacement.
• Any chassis with a 2.38mm rear axle and Sidewinder configuration requiring a ø16.5mm crown with 32 teeth.

Common Mistakes When Installing Crown Gears

One of the most common mistakes is not checking the lateral alignment between the motor pinion and the crown: if they are not in the same plane, wear accelerates and transmission efficiency is lost. Another frequent error is overtightening the fixing screw, which can slightly deform the central hole of the polyamide and compromise centring. A firm but moderate tightening, along with a visual check of the tooth play, is sufficient for a correct installation.

Frequently Asked Questions

Is this crown compatible with module 50 pinions?

Yes. The designation M50 in the product name indicates that it corresponds to module 50, so you should pair it with pinions of the same module to ensure correct meshing and uniform wear.

Can I use this crown in Inline or Anglewinder configuration?

No. This crown is specifically designed for Sidewinder configurations, where the motor operates parallel to the rear axle. For Inline or Anglewinder setups, the mounting geometry and crown requirements are different.

What is the difference between a polyamide crown and a metal one?

Polyamide crowns like the Procomp-RS offer less noise during operation, greater impact damping, and less wear on the motor pinion. Metal crowns are stiffer and may be preferable in very high-power setups, but in most club and amateur competition applications, polyamide provides excellent performance with an extended lifespan.

Does the M2.5 fixing screw come included with the crown?

The available product information does not specify whether the M2.5 screw is included in the package. We recommend checking directly with our team before placing your order if you need confirmation.

How many teeth should the pinion have to pair with this 32-tooth crown?

It depends on the gear ratio you are looking for and the motor used. A common ratio in club competition ranges from 3:1 to 4:1, which with a 32-tooth crown corresponds to pinions of approximately 8 to 10 teeth. Adjust according to the circuit, motor, and regulations of your championship.

The Scaleauto SC-1163R is a 32-tooth Sidewinder crown gear in Procomp-RS polyamide, with ø16.5mm outer diameter, designed for 2.38mm axle and M2.5 grub screw. A precision slot car transmission part ideal for 1/32 scale competition builds, club racing and performance tuning. Compatible with module 50 pinions and suitable for Sidewinder motor configurations.