Karts manufactured out of different materials are known. For instance, there are karts which have a metal framework as the base structure. Because of the fact that with karting, the chassis is involved in many collisions, causing unwanted deformations, the metal framework is made out of thick tubes. In this way, a very stiff construction is obtained which causes poor driving properties because of the lower flexibility. To solve this problem, a tyre is needed which has a high grip performance.

Other karts are karts which are made out of a composite structure with a great flex, for instance manufactured by means of a resin transfer moulding (RTM) process.

These type of karts have more flexibility, and accordingly, a less flexible tyre is needed.

Until now, tyres for karts are known which have a rim diameter of 5"or 6". How larger the rim diameter, how smaller the side of the tyre is (for tyres with the same tyre height). Accordingly, tyres with a rim diameter of 5"are called high profile tyres and have a large side, while tyres with a rim diameter of 6"are called low profile tyres and have a small side.

5"tyres are most frequently used for karts. Because of the fact that these high profile tyres have a large side, this side will contribute that the tyre can deform when a kart takes a bend at a high speed. However, this possibility of deformation has a positive influence on the grip of the tyre onto the road. Accordingly, a hard compound can be used for such tyres.

6"tyres have a small side, through which on the one hand the tyre is less exposed to deformation then a 5"tyre. Because of that, the tyre has less grip on the road then a 5"tyre, through which a 6"tyre has to be made out of a soft compound, which results in a reduced life span of such a tyre. On the other hand, through the small side, the tyre isn't able to absorb a lot of shocks and provides accordingly in a much smaller driving comfort then a 5"tyre.

Regarding to composite kart with a great flex, when high profile tyres are used, the result will be that the kart won't have a stable road-holding quality. Conversely, when low profile tyres are used, the kart will be submitted to a lot of vibrations, through which there is no more driving comfort.

The purpose of the invention is to provide a tyre, more specifically a tyre for a kart, which has a good grip onto the road, which allows a good driving comfort, especially with speeds of more then 20 km/h, and of which the wear is restricted.

The purpose of the invention is achieved by providing a tyre comprising the sizes: - a tyre height (A) between 9"and 12" ; - a tread width (B) between 4"and 7, 50" ; and - a rim diameter (C) between 5, 1"and 5,9".

In a preferred embodiment of a tyre according to the invention, said rim diameter is 5,5".

The tyre height of a tyre according to the invention is preferably 11".

The thread width of a tyre according to the invention can on the one hand be 4, 5" for the front wheel, or can on the other hand be 6, 5" for the rear wheel.

A tyre with such sizes allows a good driving comfort, has a good grip on the road, and has a restricted wear, when it's used with a metal frame as well as with a composite frame.

A tyre, more specifically for a kart, in which this invention is embodied, is described now by way of example only with reference to the accompanying drawings, of which: - figure 1 is a perspective view of a tyre according to the invention; - figure 2 is a section according to plane 10-10 as shown in figure 1.

As shown in figures 1 and 2, a kart tyre (1) is given by numbers, i. e.

- a tyre height (A) (or a tyre diameter); - a thread width (B); and - a rim diameter (C).

The thread (3) is the part of the tyre (1) which makes contact with the road surface and which determines the grip of the tyre (1).

When a certain tyre height (A) is considered, the side (D) of the tyre (1) is dependent on the diameter (C) of the rim (2). With a certain tyre height (A), how larger the rim diameter (2), how smaller the side (D), and reversed.

A tyre (1) according to the invention has following sizes: - a tyre height (A) between 9"and 12" ; - a thread width (B) between 4"and 7, 50" ; and - a rim diameter (C) between 5, 1"and 5,9".

Preferably, a tyre (1) according to the invention has the following sizes: - a tyre height (A) of 11" ; - a thread width (B) of 4, 5" or 6, 5" ; and - a rim diameter (C) of 5,5".

The most preferred embodiments of a tyre (1) according to the invention are 11 x 4.50-5. 5 and 11 x 6.50-5. 5, in which the first figure is the tyre height (A), the second figure is the thread width (B) and the third figure is the rim diameter (C).

This is an ideal tyre for instance for application in a kart with a RTM chassis.