Aluminium Crown Stop

The crown stopper that provides stability to your transmission

The SWST01 Aluminium Crown Stopper from Sideways is one of those small details that makes the difference between a transmission that works well and one that operates flawlessly. Designed for 2.38 mm axles, its function is to keep the crown in the exact position you need, without shifting during the race.

Function and performance

When preparing a slot car, the alignment of the crown with respect to the pinion is one of the most critical adjustments. A well-placed stopper prevents the crown from migrating laterally under load or vibration, resulting in a smoother transmission, less wear, and a more predictable response on track.

The use of aluminium for this part is not coincidental: it provides lightness without sacrificing strength, and its machining allows for a precise fit on the axle, without unwanted play.

Compatibility

This stopper is specifically designed for 2.38 mm axles, a common diameter in many competitive slot car setups. It is compatible with Sidewinder (motor parallel to the rear axle) and Inline (motor in line with the rear axle) configurations, as long as the axle diameter corresponds.

Installation and preparation

Installation is straightforward but requires attention to detail:

• Slide the stopper onto the axle before placing the crown.
• Position the crown at the optimal engagement point with the pinion.
• Secure the stopper in direct contact with the crown to act as a lateral stop.
• Check that the assembly rotates freely without rubbing against the bracket or chassis.

We recommend checking the fit both cold and after a few laps of warming up, as materials may vary slightly with temperature.

Common mistakes

• Over-tightening: this can create stress on the axle or make disassembly difficult. A firm but controlled adjustment is sufficient.
• Forgetting the stopper on one side: the crown needs references on both sides if the chassis design does not limit it by other means.
• Not checking lateral play: after securing the stopper, always check that the crown does not exert pressure on the bracket.

Frequently asked questions

What axle diameter is the SWST01 designed for?

This stopper is designed for 2.38 mm axles, which is one of the most widespread standards in competitive slot racing.

Can I use it with any type of crown?

Yes, as long as the inner diameter of the crown is compatible with the 2.38 mm axle. The stopper acts on the axle, not on the crown itself.

Is it compatible with Sidewinder and Inline setups?

Yes. The stopper works in both motor configurations, as its function is purely to provide lateral reference on the axle, regardless of the motor orientation.

How many stoppers do I need per car?

It depends on the chassis design. In many setups, a stopper is used on each side of the crown to limit movement in both directions. Check your chassis assembly sheet or the recommendation from the builder.

Can aluminium wear out with use?

Aluminium is a very suitable material for this use. With a correct fit and without excessive tightening, durability is very high for the typical usage cycle in slot racing.

The Sideways SWST01 aluminum crown stopper is a precision part designed for 2.38 mm axles, ensuring accurate crown positioning in slot car drivetrains. Essential for competitive slot car preparation, it prevents lateral crown movement in both Sidewinder and Inline motor configurations, delivering consistent transmission performance and reduced wear.