Where can I find the correct pressure for my tyres?

The sticker inside the driver's door.

The owner's manual. 

The car manufacturer's website. 

Open the driver's side door and most cars have a sticker with the correct pressures for their tyres stuck just down from the door lock on the door frame.

Go to a tire store and ask.

It’s surprising how many people have never noticed the tyre pressure info inside the door frame.

The number on the sidewall is the maximum pressure to avoid rupture. It IS NOT the correct pressure for ANY vehicle.

The weight of the vehicle and the size of the contact patch, aka the part of the tire actually in contact with the road at any given time determine the proper pressure.

The pressure recommended by the vehicle manufacturer for the tire size installed at the factory is usually printed on a tag either on the back edge of the driver door, or an the frame in the same area.

from 2 to 2 1/2 bar , or 28 psi to 35 psi .

The owners manual, on the information plate inside the driver's door.  On the tires themselves.

What a fascinating conversationalist:  tyres and make-up foundation - - - must be in big demand for the cocktail party circuit.

There's a tire spec label in the drivers door opening under the door latch striker plate. If your label is missing 35 PSI is an average pressure setting.

Open the driver's side door there should be a tag on the frame (probably center rail where the door lock connects) with the correct tire pressure info.