4 Classic Tyres 21x6 Grooved

Classic 21X6 Grooved Tyres: The Ever-Present Complement for Character Builds

When searching for a classic profile tyre that combines the right geometry with a grooved tread, these 4 tyres 21X6 (ref. CXM074) are a straightforward and no-frills option. Their design adheres to the philosophy of traditional slot racing: specific measurements, well-defined tread, and a pack of four units ready to be mounted on the rear axle — or front — depending on the setup you have in mind.

Function and Features of the Tyre

• Measurements 21X6: diameter 21 mm and width 6 mm, a classic format widely used in club setups and 1/32 scale car builds.
• Grooved Tread: the grooved tread pattern enhances track evacuation and provides balanced grip, especially on plastic or wooden circuits.
• Pack of 4 Units: the pack includes four tyres, sufficient to equip a complete car on all four wheels.

Applications and Compatibility

The 21X6 format is one of the most commonly used in the classic slot racing universe. It fits a wide variety of rims with corresponding inner diameter; always check the inner diameter of the rim and the chassis fender tolerance before mounting to ensure there are no rubs.

They are particularly suitable for:

• Vintage or retro-style cars where maintaining the aesthetic of a grooved tyre is desired.
• Club setups in categories that allow or require a grooved profile.
• Replacement of worn tyres on already run cars.

Mounting and Preparation

The mounting process is standard in slot racing: insert the tyre onto the rim, ensure it sits evenly around the perimeter, and if the setup requires it, perform a gentle turning to equalise the exact diameter on all four tyres. A uniform diameter on the rear axle is essential for stable and predictable behaviour on track.

If you are going to use them on the front axle of a fixed-steering car, ensure that the lateral play is sufficient to avoid rubbing against the body or chassis.

Considerations

• Check the inner diameter of the tyre against the outer diameter of the rim before mounting.
• The grooved tread may offer slightly different grip compared to a smooth tyre; keep this in mind when adjusting the guide and weight of the car.
• As a consumable item, wear will depend on the type of track, motor power, and driving style.

Frequently Asked Questions

How many tyres are included in this pack?

The CXM074 pack includes 4 classic 21X6 grooved tyres, sufficient to equip a complete car on all four wheels.

What does the measurement 21X6 mean?

It indicates that the tyre has an outer diameter of 21 mm and a width of 6 mm. These are the two key dimensions to check against the rims and chassis before mounting.

On what type of track do these grooved tyres perform best?

The grooved tread offers good performance on rigid plastic and wooden tracks. On fabric or braid tracks, grip will also depend on the tyre compound.

Do I need glue to mount these tyres on the rim?

It depends on the fit between the rim and tyre. If the fit is snug, it is usually not necessary. If there is play, a small amount of contact adhesive specifically for slot tyres will ensure they do not shift during racing.

Can these tyres be turned?

Yes, like most slot tyres, they can be turned on a wheel lathe to equalise the diameter and improve stability. It is recommended to make gentle passes and monitor the final diameter.

Classic 21X6 grooved slot car tyres — set of 4 units (ref. CXM074). Perfect for 1/32 scale slot car builds with vintage-style rims or club racing setups requiring a specific tread profile. Compatible with a wide range of hubs; always check inner diameter before fitting. Available at Ministry of Hobby, your specialist slot car and scale modelling store.