Crown gear 29d. Reverse

Precision transmission for Anglewinder setups: the Scaleauto 29d. Reverse Crown

The Scaleauto 29d. Reverse Crown SC-1169BR is a transmission component made of Polyamide within the Procomp-RS line, specifically designed for Anglewinder configurations. With 29 teeth, M50 module, 25° angle, and an outer diameter of 15.8 mm, it fits into setups where a specific gear ratio is sought without sacrificing reliability or precision in meshing.

Technical specifications

• Number of teeth: 29
• Module: M50
• Angle: 25° (AW — Anglewinder)
• Outer diameter: ø15.8 mm
• Axle diameter: 2.38 mm
• Material: Polyamide (Procomp-RS)
• Fixing system: M2.5 Reverse Insert screw
• Reference: SC-1169BR

Function and performance

In a slot transmission, the crown is the component that receives the motion from the pinion mounted on the motor shaft and transfers it to the rear axle. The choice of the number of teeth directly determines the gear ratio: a higher number of teeth on the crown compared to the pinion results in greater torque and lower top speed; and vice versa. With 29 teeth, this crown offers a widely used balance point in club and competition setups.

The Polyamide material from Scaleauto's Procomp-RS line has established itself as a benchmark in the industry due to its good wear resistance, light weight, and ability to maintain stable geometry under prolonged use cycles. It is particularly suitable when a quiet and durable meshing is sought in the day-to-day circuit.

Compatibility and installation

This crown is designed for 2.38 mm axles, a standard measurement in most Scaleauto platforms and many competitive chassis on the market. The Reverse Insert fixing system with M2.5 screw allows for a firm adjustment and quick disassembly in the workshop, which is very practical when working with various gear ratios depending on the circuit.

As it is a 25° AW crown, its natural use is in Anglewinder configurations, where the motor is positioned at an angle to the rear axle. Before installation, it is advisable to check that the motor pinion has the same M50 module and angle to ensure correct meshing without vibrations.

Common mistakes when installing crowns

• Mixing different modules: a M48 pinion with a M50 crown results in poor meshing and accelerated wear. Always check that the pinion and crown share the same module.
• Incorrect angle: AW crowns are not interchangeable with Sidewinder or Inline configuration crowns. Ensure that the 25° angle corresponds to your transmission system.
• Insufficient fixing: tightening the M2.5 screw with the appropriate torque is key to preventing the crown from shifting laterally during a race. Use a precision Allen key.
• Not checking lateral play: after installation, check that the crown rotates with minimal clearance between the chassis plates to avoid unwanted rubbing.

Ideal for…

This crown is the usual choice of enthusiasts and tuners working with Scaleauto Anglewinder chassis or similar platforms, both in club sessions and in federated competition. Its 29-tooth profile makes it versatile for mixed layout circuits where a balanced transmission between acceleration and top speed is sought.

Frequently asked questions

What is the difference between a Reverse crown and a standard one?

The term "Reverse" refers to the Insert fixing system, which allows the crown to be mounted from the opposite side to the usual or to use a reverse insertion screw. This facilitates access to the M2.5 screw in certain chassis configurations where space is limited.

Which pinions is this crown compatible with?

It must be combined with pinions of M50 module and 25° angle to ensure correct meshing. Scaleauto offers a wide range of pinions with different tooth counts that meet these specifications.

Is it suitable for official competition?

Yes. The Scaleauto Procomp-RS line is widely used in club championships and federated competitions. It is advisable to consult the specific regulations of each category to verify if Polyamide crowns are allowed or if aluminium crowns are required.

How long does a Polyamide crown last?

Durability depends on meshing, lubrication, and usage conditions. Under normal track conditions, a well-adjusted Procomp-RS crown can withstand many sessions without noticeable wear. It is recommended to check it periodically and replace it if play or deformation in the teeth is observed.

Do I need special tools to install it?

Only a precision Allen key of the appropriate size for the M2.5 screw is needed, and optionally, a gauge or thickness ruler to check lateral play. No press or special tooling is required.

The Scaleauto SC-1169BR is a 29-tooth Procomp-RS Polyamide crown gear for anglewinder slot car setups, featuring M50 module, 25° angle, ø15.8mm outer diameter, 2.38mm axle bore and M2.5 Reverse Insert fixing screw. A reliable and lightweight transmission component widely used in club racing and competition, compatible with standard Scaleauto anglewinder platforms and similar 1/32 slot car chassis.