The importance of foam inserts in RC car tires
RC (radio-controlled) cars are a hobby that fascinates thousands of enthusiasts around the world. The constant quest for performance, improvement and optimization leads enthusiasts to examine every component of their miniature vehicle, from the bodywork to the tires. In particular, tires, and more specifically the foam inserts that give them their shape, play a crucial role in the performance of RC cars.
Indeed, unlike their full-size counterparts, RC car tires are neither inflatable nor waterproof. To prevent them from distorting or "bending" in high-speed corners or in a straight line, they need internal support , usually provided by foam inserts. These inserts not only help maintain the shape of the tire, but also optimize its performance depending on track conditions.
Closed cell inserts VS open cell inserts
There are mainly two types of foam inserts used in RC cars: closed cell inserts and open cell inserts . Each has advantages and disadvantages, and their effects on the car's handling vary greatly.
Closed-cell foam inserts resist better over time, retain their original shape more effectively and prevent water from penetrating inside the tire. They are often used on smooth, high-grip tracks .
In contrast, open-cell foam inserts expand and contract more easily, allowing for greater tire flexibility, which can improve traction in certain situations. However, their durability is less, and they can absorb water. These inserts are generally preferred on bumpy or low grip tracks .
How to choose the right foam insert for your RC car?
Choosing the right foam insert depends largely on the type of tire you are using and the conditions of the track you plan to ride on. The softer the tire carcass, the more dense support it needs to compensate. Closed-cell foams, for example, provide sturdy support that prevents the tire from deforming when cornering. On the other hand, a softer foam may be preferable for bumpy trails or where grip is lower.
The fit of the foam inside the tire is also crucial. The inner diameter of the foam must be properly adjusted to avoid movement when driving. Some professionals even go so far as to glue the interior part of the foam to the wheel to optimize the handling of the car.
Understanding the Hardness of Foam Inserts for RC Cars
The hardness of the foam inserts plays a vital role in the performance of your RC car. As we mentioned earlier, the firmness of the foam has a direct impact on the tire's ability to maintain its shape while driving. This feature is particularly relevant when cornering at high speeds and on difficult terrain .
The hardness of the foam: A factor of stability
Hard foam inserts provide maximum support to the tire. They allow the tire to maintain its shape, even under the pressure of high-speed cornering or when accelerating. In fact, hard foam reduces tire deformation, which helps maintain a stable and predictable contact zone with the track. This feature is particularly useful when driving at high speeds on flat, smooth surfaces , where steering precision and stability are essential.
Flexibility of the foam: An asset for grip
Conversely, soft foam inserts allow for greater tire flexibility . This flexibility increases the contact area of the tire with the ground, which can improve traction, especially on uneven or bumpy surfaces . The soft foam allows the tire to deform and better follow the contours of the terrain. However, this flexibility can also lead to greater tire deformation when cornering at high speeds, which can reduce the stability of the car.
The different types of foam inserts
Besides closed and open cell foam inserts, there are other types of inserts you might want to consider. Normal or regular foam inserts , for example, are the simplest and least expensive. Dual-layer foam inserts , on the other hand, offer a combination of firmness and flexibility, with a harder inner layer for support and a softer outer layer for shock absorption.
The size of the insert may also vary. Wider inserts support the tire sidewalls better, which can be especially useful for drift fans . However, narrower inserts may be preferable for smaller tires or for specific driving conditions.
RC Car Tire Treatments
In addition to choosing the right foam insert, you can also consider applying tire treatments to further optimize their performance. These treatments aim to increase the grip of the tires by softening them. Easy to apply, they can make a noticeable difference on the track.
