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The primary purpose of the tyre is to provide traction.

1. Tyres also help the suspension absorb road shocks, but this is a side benefit.
2. They must perform under variety of conditions. The road might be wet or dry; paved with asphalt, concrete or gravel; or there might be no road at all.
3. The car might be traveling slowly on a straight road, or moving quickly through curves or over hills. All of these conditions call for special requirements that must be present, at least to some degree, in all tyres.
4. In addition to providing good traction, tyres are also designed to carry weight of the vehicle, to withstand side thrust over varying speeds and conditions, and to transfer braking and driving torque to the road.
5. As the tyre rolls on the road, friction is created between the tyre and the road. This friction gives the tyre its traction.
6. Although good traction is desirable, it must be limited.
7. Too much traction means there is too much friction.
8. Too much friction means there is lot of rolling resistance.
9. Rolling resistance wastes engine power and fuel, therefore it must be kept to a minimal level. This dilemma is a major concern in designing today’s tyres.
10. The primary purpose of the tyre is to provide traction along with carrying the weight of the vehicle.