What is the correct tyre pressure for tyre size 205/40/17?

Question

The alloy wheels are aftermarket wheels and not standard on my car so vauxhall guidlines wont help.

Answer 1

most are around 35 psi

Answer 2

The pressures on the tire are NOT to be used as recommended pressures for your car. They are the pressures used for maximum load capacity of that tire. Your car will not put that much load on the tire. Agreed that the door sticker may not apply now, if these are not standard tires.

The recommended tire pressures by manufacturers of the car are to provide full contact of the tire surface on the road at a given weight or load on the tire.

Let me ask this, is the tread surface or width and ply rating similar to the original? Just the wheel diameter is different?

If similar width, try original recommended pressures. Over time, too much and the tires will wear in the middle, too low and they wear on both sides on the outsides.

Good Luck

Answer 3

look closely at the sidewall of the tire....it will give you the minimum and maximum cold air pressure, the info is molded right into all tires

Answer 4

read the sidewall, it will tell you, don't go by the sticker on the door,the car people didn't make the tire, the tire people did

Answer 5

The size of the TIRE have nothing to do with pressure.

AND what the side wall says is NOT the correct pressure.  That is just the MAX tire pressure.  The correct tire pressure is determined by the car manufacturer (usually on the door panel area).

Good Luck.

Answer 6

Do not exceed the maximum pressure indicated on the tire sidewall of car tires.