How much pressure I have to put on my tires, max and min if the specs are mustang v6 08, 245/40/18 with 18x9 in the front and 275/45/18 18x10in the rear? Thanks

 

I may just making a mistake but the pressure is always the same mate, bigger tires = more air but same pressure at the end... i think it works like this, but confirm with other's

cumps

 

you are incorrect Fabio but I can't help with the correct answer to the OP's question. Where did you get the wheels and tires from JPHS?

 

the tire pressures are on the jamb sticker. those are for the stock wheels and tires that came on the car. you can compare what it says to what the tire says. if you change wheels or tires you need to go by what it says on the tire itself. it will say something like 50 lbs. max. i usually take that number and drop it a few lbs. or more depending on

mileage, how the car handles, how the tires contact the pavement and how they are wearing, weather for traction ect.

the max might give the best mileage but traction is reduced. maybe poor handling. depending on how the tire fits the wheel it could also cause heavy wear in the centers or edges ect. keep a close eye on your pressures and tire wear

 

there is a mathematical equation for this. It has to do with rim width and tire size.
You can pm a member on here his user name is stoner he can help you.


I have 275 35 20 on a 10 inch rim and I believe I am suppose to be running around 44 psi. On the front I am running 355 35 20 on a 8.5 rim and run 41 lbs
Both tires state 50lbs max pressure.

I would think tire rack or discount tire might be able to help you but I'm not sure if they would know one or the other either. Stoner is your best bet imo

 

Just depends on what you prefer. Anything over about 32psi is good up to about 45. Remember as your tires heat up the pressure will increase and decrease when cold. I prefer 35-40 range and it really depends on if you like the way it feels at higher air pressures. I've noticed on my own tires that running about 35 wears the tires nice and even which means the they have an even pressure on the full contact surface. Too low will wear the outside treads and too high will wear the center.