Lightened Crown Stop M2.5 Red

The crown stop without adding extra grams: lightweight M2.5 red stop from Scaleauto

When working with the transmission of a slot car, every tenth of a gram counts. The Lightweight M2.5 Red Crown Stop (SC-1124R) from Scaleauto is one of those small parts that makes the difference between a careless assembly and a truly prepared one: it accurately fixes the lateral position of the crown gear on the axle without adding unnecessary mass to the rotating assembly.

Features and technical specifications

• Reference: SC-1124R
• Thread: M2.5
• Colour: Red
• Compatible axle diameter: 2.38 mm
• Dimensions: 6.20 x 2.48 mm
• Weight: 0.15 g
• Manufacturer: Scaleauto

Function and performance

The crown stop has a critical yet discreet mission: to prevent axial movement of the crown gear during operation. A small lateral play in the crown can translate into a loss of efficiency in the transmission, uneven wear of the pinion, or even the crown coming off during a race. The lightweight design of this part fulfills that function without increasing the moment of inertia of the axle, which is particularly relevant in competition-oriented setups where maximum response in acceleration and braking is sought.

Compatibility and installation

This stop is designed for axles with a 2.38 mm diameter, the most common standard size in competitive slot racing. The M2.5 thread ensures a secure and controlled tightening. The red colour facilitates quick visual identification on the workbench, especially useful when working with various references of stops with different threads or sizes.

For installation, it is recommended to use a wrench or tool suitable for the type of head of the stop and to ensure that the crown is centred relative to the pinion before finally tightening. Excessive tightening can hinder future disassemblies; insufficient tightening would compromise the stability of the transmission.

Ideal for…

This stop is the natural choice for any preparer who assembles or reviews the transmission of slot cars compatible with a 2.38 mm axle. Whether for a club competition preparation or fine-tuning on a road car, the combination of low weight and reliable holding makes it a reference to always have in the workbench drawer.

Frequently asked questions

What axle diameter is this stop designed for?

This lightweight crown stop SC-1124R is specifically designed for axles with a 2.38 mm diameter, the most widespread standard size in competitive slot racing.

What advantage does the lightweight design offer compared to a conventional stop?

By reducing the weight of the part (0.15 g), the rotating mass of the transmission assembly is minimised, improving the motor's response to acceleration changes and reducing inertia during braking. In competition, these details have a real impact on performance.

Is the M2.5 thread compatible with standard slot preparation tools?

Yes. The M2.5 thread is one of the most common in precision screws for slot racing, and most preparation tools on the market are compatible with this size.

Does the red colour have any technical function or is it just for identification?

The colour is fundamentally for identification. Scaleauto uses different colours in its range of stops to facilitate quick differentiation between references on the workbench, avoiding confusion between stops of different threads or sizes.

Is it sold individually or in a pack?

The information provided does not specify the number of units per package. We recommend checking the product description in the store or contacting us to confirm before placing the order.

The Scaleauto SC-1124R is a lightweight M2.5 crown stop in red, specifically engineered for 2.38 mm axles used in slot car competition. Measuring 6.20 x 2.48 mm and weighing just 0.15 g, it ensures precise lateral positioning of the crown gear while keeping rotational mass to a minimum — a key factor for competitive slot car builders seeking faster throttle response and consistent gear mesh on the track.