How many different tires are allowed on a car?

1. All tires on the car must be of the same manufacturer, compound and size
2. All tires on the vehicle must be of the same manufacturer and compound but may have different sizes
3. Tires are not regulated
4. All tires on one axle must be of the same manufacturer, compound and sizeCorrect
5. The vehicle may have different tires on all four corners but the configuration must be the same as presented during tech inspection.