Bag - 2 Tyres SR 1/24 R Needle 21x11mm

SR Needle Type Tyres for 1/24 Slot: Direct Replacement in a Pack of 2 Units

The reference PN003RA from PKS offers a pack containing 2 SR tyres in 1/24 scale, with a needle profile and measurements of 21x11 mm. A specific replacement, straightforward, designed for those who need to replenish rubber quickly and accurately.

Tyre Features

• Quantity: pack of 2 tyres.
• Type: SR — needle profile (narrow).
• Scale: 1/24.
• Measurements: 21 mm diameter × 11 mm width.
• Manufacturer reference: PN003RA.
• Brand: PKS.

Function and Performance

The needle profile, narrower than a standard tyre, reduces the contact surface with the track. This results in lower rolling resistance and a more responsive feel on the straights. It is a common choice in setups aimed at top speed, especially on fast tracks with low abrasion.

The measurements 21x11 mm correspond to a rear tyre in 1/24 scale, a frequent format in competition cars of this scale. Before mounting, it is advisable to check the axle diameter and hub width to ensure a proper fit.

Mounting and Preparation

For a clean installation, we recommend cleaning the hub with isopropyl alcohol before placing the tyre, and checking that it is centred before any turning or grinding process. When working with a tyre lathe, the needle profile requires gentle passes to avoid excessively reducing the working diameter.

Once mounted, a light sanding with fine-grit paper and a final degreasing enhance grip from the first metre on the track.

Compatibility

PKS is a manufacturer specialised in slot replacements. The designation SR 1/24 indicates compatibility with 1/24 scale platforms that use hubs of equivalent dimensions. Check your chassis specification or the PKS measurement chart to confirm exact compatibility with your model before ordering.

Common Mistakes

• Confusing the needle profile (narrow) with a standard width tyre: the code R Aguja in the name explicitly indicates the reduced profile.
• Mounting the tyre without cleaning the hub, which can cause eccentricity.
• Not checking the diameter before turning, risking falling below the functional minimum.

Frequently Asked Questions

How many tyres are included in this pack?

The pack contains 2 SR needle type tyres of 21x11 mm.

What does "needle type" or needle profile mean?

The needle profile refers to a tyre that is narrower than usual. By reducing the contact patch, it decreases lateral friction and resistance on the straights, at the cost of slightly less grip in high-demand corners.

What scale are these tyres designed for?

They are designed for slot cars in 1/24 scale. They are not interchangeable with 1/32 scales without verifying measurements, as diameters and widths differ significantly.

Do I need to turn them before use?

It is not strictly necessary, but turning the tyres to ensure perfect concentricity improves track performance, especially in competition. For recreational use, careful mounting and gentle sanding are usually sufficient.

What hubs are they compatible with?

Compatibility depends on the inner diameter of the tyre and the hub of your wheel. Check the technical documentation from PKS or the specifications of your 1/24 chassis to confirm before mounting.

PKS PN003RA slot tyres — narrow profile SR 1/24 scale, 21x11 mm. Ideal for 1/24 slot car racing setups requiring reduced rolling resistance. Compatible with standard 1/24 hubs matching the inner diameter. A reliable replacement tyre for club racing and home track enthusiasts looking for consistent grip and precise fitting.