Crown gear 31d. Anglewinder 25° Procomp-R

31-Tooth Anglewinder Crown Gear at 25° for Scaleauto's Procomp-R Line

When preparing a slot car for competition, the choice of crown gear is not a minor detail: it directly defines the gear ratio, acceleration response, and behaviour on straights. This 31-tooth crown gear, designed for anglewinder configurations at 25°, fits into Scaleauto's Procomp-R range and is aimed at drivers seeking precision in their vehicle setup.

Product Features

• Number of Teeth: 31
• Configuration: Anglewinder at 25°
• Compatible Line: Procomp-R by Scaleauto
• Reference: SC-1171R
• Manufacturer: Scaleauto

Function and Performance

The crown gear is the gear that receives the motion from the motor pinion and transmits it to the rear axle. In an anglewinder setup, the motor is positioned at an angle to the rear axle, allowing for optimised weight distribution and facilitating the adjustment of the centre of gravity height. Correctly choosing the number of teeth on the crown gear relative to the pinion determines the gear ratio: more teeth imply greater torque and better acceleration out of corners; fewer teeth shift the advantage towards top speed on straights.

With 31 teeth, this crown gear offers a balance suited for tracks with many curves or for drivers who prioritise corner exit over maximum speed on straight sections.

Compatibility and Installation

This crown gear is specifically designed for the chassis and drivetrain assemblies of Scaleauto's Procomp-R range. Before placing an order, ensure that your motor pinion is compatible with the module of this crown gear, as an incorrect combination can lead to play or interference that affects the performance and lifespan of both gears.

The 25° angle is characteristic of Scaleauto's anglewinder system: do not interchange this crown gear with sidewinder or inline configurations, as the tooth angle is calculated for the specific working plane of this type of setup.

Installation and Preparation

To get the most out of this crown gear, pay attention to the following points during installation:

• Ensure that the crown gear is perfectly aligned with the pinion, with no lateral deviation.
• Check the clearance between teeth: neither too tight (causing heat and wear) nor too loose (leading to loss of efficiency and noise).
• Apply a minimal amount of specific lubricant for slot transmissions; excess attracts dirt and unbalances the crown gear.
• Check the condition of the rear axle and bearings before installing a new crown gear, as a loose axle transmits vibrations that prematurely deteriorate the gear.

Common Mistakes

One of the most common mistakes when changing the crown gear is not recalculating the total gear ratio. If you combine this 31-tooth crown gear with an unsuitable pinion, the motor may operate outside its optimal RPM range, reducing both performance and lifespan. Consult Scaleauto's recommended ratio tables for your motor and track type before deciding.

Frequently Asked Questions

What is the difference between anglewinder, sidewinder, and inline?

In a sidewinder setup, the motor is parallel to the rear axle (transverse). In an inline setup, the motor is positioned perpendicular to the rear axle, in line with the car, lowering the centre of gravity. In an anglewinder setup, the motor is tilted at an angle to the rear axle. Each configuration has specific crown gears and pinions designed for the corresponding working angle.

Is this crown gear compatible with any anglewinder chassis?

Not necessarily. This crown gear is designed for Scaleauto's Procomp-R range. Although the 25° angle may match other anglewinder systems, the gear module and the diameter of the central hole may differ. Always check compatibility with your chassis and pinion before installation.

How do I know what gear ratio I need?

The gear ratio is calculated by dividing the number of teeth on the crown gear by the number of teeth on the pinion. For tracks with many curves and chicanes, longer ratios (crown gear with more teeth) are typically used; for fast tracks with long straights, shorter ratios. The best way to find your optimal point is to test different combinations in timed practice sessions.

How often should I replace the crown gear?

It depends on usage, lubrication, and the quality of the fit with the pinion. In regular competition, it is advisable to check the condition of the teeth every few sessions and replace the crown gear when significant wear, excessive play, or loss of smoothness in the transmission is observed.

Can I use this crown gear on Sport track and also on Universal track?

The crown gear itself is not limited by the type of track, as it is part of the internal transmission system of the car. Its compatibility depends on the chassis and anglewinder system you use, not the type of track.

The Scaleauto SC-1171R is a 31-tooth anglewinder crown gear at 25°, designed for the Procomp-R range. A precise and reliable component for slot car tuning, ideal for club racing and competitive slot car preparation. Compatible with Scaleauto Procomp-R drivetrains and anglewinder motor configurations.