4 Classic Tyres 21x6 Smooth

Classic smooth profile tyres 21x6: the contact that makes the difference on track

When it comes to serious slot preparation, tyres are one of the elements that most influence the actual behaviour of the car. These 4 classic smooth tyres measuring 21x6 (reference CXM072) offer a completely flat tread surface, designed to maximise the contact area with the track asphalt and achieve the best possible grip in competitive or intense running conditions.

Features and function

The smooth profile is the usual choice in competitive slot racing when the track is in good condition and a direct and predictable response is sought. With no tread, the entire width of the tyre works in contact with the track, resulting in more uniform traction and a cleaner response both in acceleration and braking.

• Measurements: 21 mm diameter × 6 mm width.
• Profile: smooth, without tread, for maximum contact surface.
• Format: supplied in packs of 4 units.
• Reference: CXM072.

Mounting and preparation

To get the maximum performance from these tyres, it is advisable to mount each one ensuring it is well centred on the rim and without irregular tensions. Once mounted, light sanding or turning is common practice in the preparation world to ensure perfect concentricity, especially if precision is sought in club competition. A well-prepared tyre eliminates vibrations and improves cornering stability.

Compatibility and applications

The 21x6 measurements are common in a wide variety of slot cars. However, before mounting, always check the specifications from the manufacturer of your chassis or rim to ensure that the diameter and width fit correctly with your setup. The reference CXM072 is a classic replacement, frequently used in setups with standard diameter rims.

Ideal for…

• Club competitors looking to replace worn tyres with a proven reference.
• Preparers wanting to experiment with different hardnesses and profiles in their track setup.
• Enthusiasts who engage in intense running and need to always have spare tyres on hand.

Aspects to consider

The final performance of the tyre also depends on the hardness of the compound, the cleanliness of the track, and the condition of the rim. Ensure that the rims are free from glue residue or dirt before mounting the new tyres, as any irregularity can affect centring and grip.

Frequently asked questions

How many tyres are included in this pack?

The pack includes 4 tyres, sufficient to equip a complete car (2 axles) or to have spare units on hand during a competition session.

What type of track are smooth profile tyres recommended for?

Slick tyres perform best on clean and well-prepared tracks, where the surface is uniform. On tracks with a lot of dust or irregularities, a profile with a bit more texture may offer greater stability.

Is it necessary to turn or sand the tyres before using them?

It is not strictly necessary for recreational use, but in club competition, it is common practice to ensure concentricity through light sanding or turning. This eliminates potential vibrations and improves cornering performance.

What adhesive is recommended for securing the tyres to the rims?

Most preparers use low-viscosity cyanoacrylate applied carefully to avoid contaminating the tread. If the tyre is well fitted by pressure beforehand, in many cases, adhesive is not needed.

Can I use these tyres on tracks with universal rail (Scalextric, Ninco) and also on tracks with sport rail (Scaleauto, Slot.it)?

The type of rail does not directly affect the choice of tyre; what is relevant is that the tyre measurements are compatible with the rims of the car you are preparing. Always check the specifications of your setup.

Classic slot tyres 21x6 smooth profile (ref. CXM072) — set of 4 units. Designed for slot car racing and club competition, these slick tyres deliver maximum contact surface for consistent grip and predictable handling. Compatible with standard rims matching 21mm diameter and 6mm width. A must-have spare for serious slot car builders and racers looking to maintain peak performance on plastic and routed tracks.