Lightweight Aluminium Wheels 15.8x11mm for 3/32 Axles

Scaleauto CNC Precision for Those Who Don't Compromise on the Track

Within Scaleauto's aluminium spare parts catalogue, these lightweight wheels SC-4090F25 represent one of the most direct and effective upgrades you can make to any 1/32 scale slot car. Machined using computer numerical control (CNC) from high-precision technical aluminium, they are designed to reduce the rotational mass of the drivetrain and translate that saving into real dynamic response on the track surface.

Function and Performance

The main advantage of replacing standard plastic wheels with lightweight aluminium parts is the reduction of the gyroscopic effect. Less rotational inertia means that the motor takes less time to accelerate the wheel to track speed, braking occurs more abruptly and in a controlled manner, and the chassis responds more faithfully to power variations. In technical circuits with slow corners and chicanes, the difference is noticeable from the first laps.

The inner section of 13.6 mm provides the appropriate space to accommodate standard braking systems or chassis bearings without interference. The outer diameter of 15.8 mm and the width of 11 mm offer a stable support base consistent with the most common tyre profiles in the 1/32 competition category.

Compatibility and Assembly

These wheels are designed for standard axles of 2.38 mm (3/32"), the most common size in the vast majority of 1/32 slot cars on the market. The attachment to the axle is made using a M2.5 metric set screw, which distributes the tightening pressure evenly and prevents any play or misalignment even during long running sessions.

• Outer diameter: 15.8 mm
• Width: 11 mm
• Inner axle diameter: 2.38 mm (3/32")
• Inner section diameter: 13.6 mm
• Attachment system: set screw M2.5
• Material: CNC machined aluminium
• Pack contents: 2 units

Assembly and Preparation

The assembly does not require special tools beyond the Allen key corresponding to the M2.5 set screw. To achieve maximum concentricity, it is advisable to support the axle on an alignment jig or bench before tightening the screw, ensuring that the wheel is perfectly centred relative to the axle. Once the tyre is mounted, it is possible to true it around with confidence, as the machining precision of the wheel allows for this without vibrations or eccentricities.

It is recommended to check the tightness of the set screw after the first running sessions, especially if used in high-power configurations, to rule out any minimal slipping.

Common Mistakes

• Not checking the axle diameter before mounting: although the 3/32" (2.38 mm) axle is the most widespread standard, some competition chassis use 3 mm or 1/8" axles. Always check the measurement before ordering.
• Over-tightening the set screw: aluminium is a ductile material; excessive tightening can slightly deform the axle housing. Tighten firmly but do not overdo it.
• Confusing wheel width with tyre width: the width of 11 mm corresponds to the wheel; the mounted tyre may slightly protrude depending on the chosen profile.

Frequently Asked Questions

Are these wheels suitable for both front and rear axles?

Yes, the dimensions of 15.8x11 mm and the axle diameter of 3/32" make them technically compatible with any position, although their most common use in competition is on the rear axle, where the reduction of rotational mass has a greater impact on acceleration and braking.

Does the pack include M2.5 set screws?

The product information does not specify whether the screws are included in the pack. We recommend checking the official Scaleauto sheet or contacting us before placing your order if you need confirmation.

What tyres are compatible with these wheels?

Any 1/32 slot tyre with an inner diameter compatible with an outer wheel diameter of 15.8 mm and a width of 11 mm. In practice, they fit with most ranges of competition tyres on the market for this scale, although it is always advisable to verify the specifications from the tyre manufacturer.

Can tyres be trued once mounted on these wheels?

Yes. The CNC machining precision ensures the necessary concentricity for truing tyres without vibrations or eccentricities, which is one of the main reasons why competition preparers opt for aluminium wheels over standard plastic ones.

Are they compatible with chassis from brands other than Scaleauto?

Compatibility depends solely on the axle diameter (3/32" / 2.38 mm) and the available space in the chassis. Being a standard axle size, they are suitable for any 1/32 slot car or chassis that uses 3/32" axles, regardless of the brand.

How many wheels are included in the pack?

The pack contains 2 units.

Scaleauto SC-4090F25 lightweight aluminium wheels, 15.8x11mm, for 3/32" (2.38mm) axles — CNC-machined for perfect concentricity, reduced rotational mass and improved braking response in 1/32 slot car competition. Ideal for club racing and high-performance slot car builds. Compatible with standard 3/32" axle setups across most 1/32 scale slot cars.