33d Anglewinder Nylon Crown Gear (12.4mm) for 3mm Axle

The BRM Nylon Anglewinder Crown Gear: Precise Transmission for Your 1/32 Setup

The BRM Nylon 33d Anglewinder Crown Gear (ref. BRM-S419A) is a specific transmission spare part for anglewinder configurations in 1/32 scale. With 33 teeth, an outer diameter of 12.4 mm, and a fit for a 3 mm axle, it fits directly into BRM mounts that use this popular motorisation system.

Function and Performance

In an anglewinder setup, the motor operates at an angle to the rear axle, allowing for a lower centre of gravity and improved cornering stability. The crown gear is the final link in that transmission: it receives the motion from the pinion and transfers it to the axle, making its dimensional precision and material quality crucial for track performance.

The use of nylon compared to other materials like ergal (machined aluminium) offers clear advantages in certain contexts:

• Quieter operation: nylon dampens gear vibration.
• Less wear on the opposing pinion, especially if it is metal.
• Good performance at club speeds and intensive recreational use.
• Slightly heavier than ergal, but with a flexibility that absorbs minor alignment inaccuracies.

Compatibility and Installation

This crown gear is designed for BRM 3 mm chassis and axles with anglewinder configuration. Before installation, it is advisable to check:

• That the rear axle diameter is indeed 3 mm.
• That the motor pinion is compatible with a crown gear of 33 teeth and 12.4 mm diameter (check the pitch of the teeth with the pinion you are using).
• The gap between the crown and pinion: a too-tight fit generates heat and wear; too loose, loss of efficiency and noise.

Installation and Preparation

Installing an anglewinder crown gear requires attention to centring on the axle. A slight warping can result in noticeable vibration at high speeds. It is recommended to:

1. Clean the axle before mounting the crown to ensure a snug fit.
2. Check the centring by rotating it slowly before securing it permanently.
3. Use a small amount of axle retention adhesive only if the press fit is insufficient.
4. Review the interaction with the pinion after the first run to adjust the gap if necessary.

Common Mistakes

• Mixing different tooth pitches between crown and pinion: although they may fit physically, wear is premature and performance decreases.
• Over-tightening the crown on the axle: this can deform the nylon and cause warping.
• Confusing this reference with the ergal version (BRM-S419A is nylon): both have the same 33 teeth and diameter, but the behaviour and feel when running are different.

Frequently Asked Questions

How does this nylon crown differ from the BRM ergal version?

Both have 33 teeth and 12.4 mm diameter, but the material changes the character. The nylon version is quieter, better absorbs small alignment imperfections, and causes less wear on the pinion. The ergal version is stiffer, lighter, and preferred in competition where maximum mechanical efficiency is sought.

Which pinions is this crown compatible with?

A pinion with the same tooth pitch as this crown must be used. Check the BRM pinion chart for anglewinder and ensure the pitch matches. BRM publishes this information in their spare parts catalogue.

Is this crown suitable for sidewinder or inline configurations?

No. This crown is specific to anglewinder setups, where the motor operates at an angle to the rear axle. In sidewinder or inline configurations, the transmission geometry is different, and crowns designed for those systems are required.

Is it necessary to use adhesive to secure it to the axle?

It depends on the fit. If the press fit on the 3 mm axle is firm, no adhesive is needed. If there is play, a minimal amount of axle retention is sufficient. Never apply impact adhesive or excessive cyanoacrylate, as it may hinder future disassembly.

Can I use this crown on a non-BRM chassis?

In principle, yes, as long as the axle is 3 mm and the motor pinion is compatible in pitch and number of teeth. Dimensional compatibility does not guarantee complete functional compatibility, so it is advisable to check the geometry of the assembly before racing.

The BRM-S419A is a 33-tooth anglewinder nylon crown gear for 1/32 slot car racing, with a 12.4 mm outer diameter and 3 mm axle fit. Designed for BRM anglewinder setups, it delivers smooth and quiet power transmission, making it a reliable choice for club racing and recreational use. Compatible with BRM 3 mm axles and matching pinion gears.