Aluminium Wheel 17.8x10mm. Monza-2 for Axles 2.38mm. M2.5 Screw

Machined precision in every detail: the Monza-2 wheel from Scaleauto for 2.38mm axle

The reference SC-4078D25 is the aluminium wheel from Scaleauto's Monza-2 series, with dimensions of 17.8mm diameter and 10mm width, designed to fit on 2.38mm axles and secured with an M2.5 screw. This combination of measurements is very common in competition setups where control of non-rotating weight and perfect concentricity make a difference.

Main features

• Material: high-precision machined aluminium.
• Diameter: 17.8mm.
• Width: 10mm.
• Compatible axle diameter: 2.38mm.
• Fixing system: M2.5 screw.
• Series: Monza-2.
• Manufacturer: Scaleauto.
• Reference: SC-4078D25.

Function and performance

Machined aluminium offers two fundamental advantages over standard plastic wheels: a significantly lower rotating mass and a concentricity that does not depend on injection moulding tolerances. This translates into freer rotation, less vibration at high speeds, and a more predictable response when accelerating or braking. In club racing, where times are adjusted in hundredths, this type of detail ultimately shows up on the stopwatch.

The width of 10mm provides a generous support base for the tyre, promoting more uniform contact with the track and better power transmission. The fixing with an M2.5 screw allows for quick disassemblies and adjustments during a preparation session, without compromising the integrity of the assembly.

Compatibility and mounting

This wheel is designed for 2.38mm axles, a standard present in numerous competition chassis and in both sidewinder (motor parallel to the rear axle) and inline (motor perpendicular to the rear axle) configurations, as well as anglewinder. Before mounting, it is advisable to verify that the axle diameter of your chassis matches the specifications of the wheel to ensure a snug fit.

The M2.5 screw should be tightened with the appropriate tool and without exceeding the necessary torque to avoid damaging the aluminium. Scaleauto offers specific preparation tools for this type of work that facilitate the process.

Common mistakes

• Attempting to mount this wheel on 3/32" (nominally 2.38mm) axles without checking the actual axle tolerance: small manufacturing differences may require slight adjustments.
• Over-tightening the M2.5 screw, which can deform the housing or hinder future disassemblies.
• Mixing wheels of different diameters on the same rear axle, which would create imbalances and affect track performance.

Ideal for…

Preparers and club drivers who work on their own chassis or prepare competition cars with 2.38mm axles and want to replace standard wheels with machined aluminium components. It is also an excellent option for those building slot cars from scratch and needing reference wheels with precise measurements and proven quality materials.

Frequently asked questions

Does this wheel include the M2.5 fixing screw?

The product description indicates that the fixing system is via an M2.5 screw, but it does not specify if it is included in the pack. We recommend checking this before ordering or purchasing it separately to have it ready at the time of assembly.

Is it compatible with 3/32" (inches) axles?

The 3/32" axle is approximately equivalent to 2.38mm, which is precisely the measurement for which this wheel is designed. However, it is advisable to check the actual tolerance of the axle you plan to use, as small variations between manufacturers can affect the fit.

What type of tyre does this wheel accommodate?

With a width of 10mm and a diameter of 17.8mm, it is compatible with slot tyres that fit those measurements. Scaleauto offers a wide range of specific tyres for its wheels, so it is best to choose a tyre from the same brand and series to ensure the correct fit.

Can I use this wheel on both Sport track and Universal track?

The wheel itself is not conditioned by the type of track, but by the chassis it is mounted on. Whether on Sport track (Scaleauto, Slot.it) or Universal track (Scalextric, Ninco), the important thing is that the chassis has 2.38mm axles and that the wheel-tyre assembly is compatible with the track width.

How many units are in the pack?

The available information does not specify the number of units per pack. Please check the store listing or contact us before placing your order.

The Scaleauto SC-4078D25 is a precision-machined aluminium wheel from the Monza-2 series, measuring 17.8x10mm and designed for 2.38mm axles with M2.5 screw fixing. Ideal for slot car racing enthusiasts and competitive club builders looking for lightweight, perfectly concentric wheels to improve performance on Sport and Universal track systems. A reliable upgrade component from one of the most respected slot car parts manufacturers in the market.