Tires: kumho tyres, tire placard, inflation pressure

Question
i have kumho ecstra spt 215/40/r17 87 w on my ford focus 2004, but i can't find the recomended psi anywhere. can you help....????

Answer
Steve,

On every vehicle sold in the US, there is a sticker – commonly called the tire placard - that lists the original tire size and the proper pressure for that size.  The placard is usually located on a doorpost or in the glove box – but sometimes it is located in the trunk or on the fuel filler door.

It doesn't matter who makes the tire or what pressure is listed on the tire's sidewall, if the tire size is the same as the placard, then the pressure listed on placard is also appropriate.

If you are using a tire size that is different than what is listed on the placard, then the pressure has to be recalculated.  The calculation is not difficult, but it requires tire load tables which are not allowed to be published in the Internet because of copyright laws.  However, I have a copy and would be glad to do calculation, but the starting point is the vehicle placard: Tire size and inflation pressure.  I will also need to know the new tire size.