Tyre Patterns
1.Multi-directional Tyres
The most common tyre pattern type is the multi-directional pattern which is not sensitive to orientation with regards to a fitting position on the vehicle. The tyre performance is equal regardless of the direction of rotation.
2. Asymmetric Tyres
As car performance increases, tyre design has to keep pace and asymmetric patterns are becoming more common. The pattern is different either side of the centre line and tends to be more dense towards the inner edge. This leads to a better compromise between wet and dry handling. 3. Directional Tyres
A fashion originally developed for high performance cars is the directional pattern which provides optimum straight line stability and lower pattern noise generation. These patterns must be fitted the correct way round on the wheel and also the position on the vehicle to ensure the correct direction of rotation is achieved.
Tyre Types
Run Flat tyres
There is an increasing trend in the OE (Original Equipment) market with regards to the fitment of run-flat tyres. There are three variations on this theme of tyre: Self Supporting, Self Sealing and auxiliary supported tyres. These tyres are available in the usual tread patterns of a manufacturers range(s) and are denoted with the letters such as SSR (Self Supporting Run-flat for Continental, RFT (Run-flat technology for Bridgestone, DSST (Dunlop Self Supporting Tyre for Dunlop.
Self Supporting
Run-flat tyres
These tyres are constructed with extra layers of rubber and heat resistant cord within the sidewalls to prevent folding and creasing if the tyre loses inflation pressure. There are specific EH2 rims that are used for this particular application. these tyres can also be used in conjunction with standard rims providing the TPMS (tyre pressure monitoring system) and its sensors are present.
Self Sealing tyres
These tyres incorporate an extra layer on the inner liner that seals itself in the event of a small penetration. These are treated in the same manner as standard tyres.
Auxiliary Support Tyres
These tyres utilise an additional component known as a support ring. The ring itself, as the name implies, supports the tyre and vehicle when the tyre loses inflation pressure. Specific wheels and tyres need to be fitted to the vehicle for this particular system to be used.