Aluminium Wheel 16.9x8.5mm. Lightweight for Axles 2.38mm

Weight reduction where it matters most: the Scaleauto Lightweight 16.9x8.5mm rim for slot racing

Within the aluminium spare parts catalogue of Scaleauto, the rims from the Lightweight series hold a special place. Every gram removed from the rotational masses —wheels and tyres— has a direct and measurable impact on acceleration, braking, and cornering. At just 1.15g per unit, these rims are designed for tuners and drivers looking to maximise their lap times in every session.

Function and performance

The machined aluminium rims with Lightweight design reduce rotational inertia compared to conventional plastic or aluminium parts. In practice, this translates to:

• Quicker acceleration from a standstill or when exiting a corner.
• Shorter and more progressive braking.
• Less load on the motor during rhythm changes, which also benefits the lifespan of the assembly.

Precision machining ensures high concentricity, minimising vibrations and imbalance at high RPMs. A critical detail in competition motors that operate at thousands of RPM.

Compatibility and mounting

The dimensions 16.9x8.5mm (diameter x width) allow for use with a wide variety of high-grip tyres commonly found in the 1/32 scale. The attachment is made using a M2.5 screw, ensuring a firm grip on the axle without play that could cause vibration or premature wear.

These rims are compatible with standard 2.38mm axles (equivalent to 3/32"), a reference size in most current slot racing competition chassis. Their installation is straightforward and does not require additional adaptations in standard chassis with this axle size.

Mounting and preparation

To get the most out of these rims, consider the following points:

• Before mounting the tyre, check that the rim does not have machining burrs on the edges; if necessary, a light sanding with fine sandpaper (400-600) will resolve any minimal irregularities.
• Apply the M2.5 screw with appropriate pressure: too tight can deform the axle; too loose creates play and vibration.
• If you are going to glue the tyre, use a minimal amount of adhesive and check the centring before it dries.
• Once the rim-tyre assembly is mounted, a roller sanding is recommended to ensure perfect concentricity before the first running session.

Common mistakes

The most common mistake when working with Lightweight rims is confusing weight savings with reduced structural integrity. The machined aluminium of these parts maintains integrity under the usual loads of slot racing; it is not necessary to handle this rim with more care than any other aluminium rim. Another common mistake is not checking the axle diameter before purchase: ensure that your chassis works with 2.38mm axles before ordering.

Frequently asked questions

How much does each rim weigh and why is this relevant?

Each rim weighs 1.15g. In competitive slot racing, reducing rotational weight —even by tenths of a gram— improves motor response and shortens acceleration and braking times. It is one of the most valued parameters in the preparation of club and circuit cars.

Are they compatible with any 1/32 slot chassis?

They are compatible with all chassis that use 2.38mm (3/32") axles, which is the standard size in the vast majority of 1/32 scale slot racing competition cars. Always check the axle diameter of your chassis before installing them.

What screw do I need to secure these rims?

The attachment is made with a M2.5 screw. Ensure you use the correct size Allen key and do not overtighten to avoid marking the axle.

Do I need a specific tyre for these rims?

The dimensions 16.9x8.5mm are compatible with a wide range of high-grip tyres for 1/32 slot racing. Check the specifications of the tyres you are already using or contact us if you have questions about the optimal combination for your track and driving style.

Can they be used on both wooden and plastic tracks?

Yes. The rim itself is suitable for any surface; the choice of the right tyre (hardness, compound) varies according to the type of track. The Lightweight rim only provides advantages in terms of rotational mass, regardless of the pavement.

How many rims are included in the pack?

The reference SC-4048F25 corresponds to a pack of 25 units, as indicated in the product reference itself. Ideal for preparation workshops or drivers who regularly consume materials during the championship season.

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