| The correct tire pressure is the one from Mercedes Benz. The tire manufactures give you the maximum tire pressure that is allowed for the tire. Your vehicle has a pre-determined weight and requires a certain amount of tire pressure to maintain ride quality. If your vehicle recommends that your tire pressure be at 30PSI and the tire maximum pressure is 45PSI and you fill the tire to the maximum, you will have uneven wear (wear pattern will be thin treads in the middle and normal tread on the outside edges). The tire company will make a tire and not know what car it is going to be installed on, however the auto company knows the perfomance demands on their car, and will install a tire rated to meet their standards. That is why tires companies have standarized letter ratings. |