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question about inflating tires
- Thread starter eshtog
- Start date
Pepsi90919
Lifer
look in the glove box, there should be a placard there with the tire inflation recommendation. probably says 32 psi.
if not there look on the driver's door jamb.
if not there look on the driver's door jamb.
FrustratedUser
Lifer
No no no. Usually tires are inflated to around 30 - 35 punds.
First the tires should be checked when cold, that is what the numbers on the door(or where ever they are on that car) are rated at.
For the area I live in 36Front and 34rear is a good setting. If you go on the highway then lowwer them a little as tires will get hotter on the highway and wear uneven.
36 Front
34 Rear
COLD
For the area I live in 36Front and 34rear is a good setting. If you go on the highway then lowwer them a little as tires will get hotter on the highway and wear uneven.
36 Front
34 Rear
COLD
Remind me never to go that tire place.
Tire pressure is always set according to the vehicle manufacturers specifications. The reason for this is that the same type of tire is often used on different types of cars with different weight ratings, weight distribution (front or rear wheel drive), and the type of vehicle it is.
That said, unless your driving a truck, you shouldn't be running your tire pressure that high. You're most likely experiencing a loss of traction, and significant tire wear in the middle of the tread - not to mention a distinct possibility of blowout. The only car I know of (and yes, I'm in the business) that requires a tire pressure that high is a 911 Porsche (in the rear). This is due to it's unique weight distribution and the fact that it's a performance car.
Trucks on the other hand, sometimes need tire pressures well above 65psi.
Angrymarshmello
Lifer
Go with 35.
Evadman
Administrator Emeritus<br>Elite Member
It is written on the dor jamb. the sidewall just lits the maximum the tire can endure before it goes pop. If you are carying more weight then normal (but stillw ithin the vehicles weight rating) then you will need more pressure. If all your car caries is you, then you can likely go less.
This is how you figure it out for your specific car and application. Fill the tire to recomended pressure. Use a piece of chalk to mark the tire in a 2" wide band across the tire tread, then drive around the block. Then check the chalk band. If more chalk is whiped off in the center then the sides, then the tirte is overinflated. if it is wearing more at the edges, then it is under inflated. Change the PSI by 2-4 psi and retest till it is even across the entire band. Then write that PSI somewhere, as that is what you should be inflating to. You will need to do this on the front and rear. If you want to be perfect, then do all 4 tires since the drivers side will likely need more pressure (maybe 1-2 psi) as that is the side that you sit on.
My dodge had a recomended pressure of 55 psi front and 85 rear. I never really caried anything in the back, so it was way less. When I switched to the thornbirds, the pressure I ended up using was probably less then what you will be running. the max pressure for the thornbirds was 45 psi. Putting 85 psi in them would have severly bowed the tread, and likely damaged the tire, if not caused a blowout. The tire place put in 50ish lbs all around(discount tire). After the chalk test, I ended up running 30 psi front, and 25 rear. I had a 5 gal air tank so if I needed to take a load of bricks to a customers house, I could just toss another 20 psi in the rear if I had to.
Having your tires properly inflated gives you the best gas milege, best handling, and longest life. If you screw up, you can end up on your roof.
This is how you figure it out for your specific car and application. Fill the tire to recomended pressure. Use a piece of chalk to mark the tire in a 2" wide band across the tire tread, then drive around the block. Then check the chalk band. If more chalk is whiped off in the center then the sides, then the tirte is overinflated. if it is wearing more at the edges, then it is under inflated. Change the PSI by 2-4 psi and retest till it is even across the entire band. Then write that PSI somewhere, as that is what you should be inflating to. You will need to do this on the front and rear. If you want to be perfect, then do all 4 tires since the drivers side will likely need more pressure (maybe 1-2 psi) as that is the side that you sit on.
My dodge had a recomended pressure of 55 psi front and 85 rear. I never really caried anything in the back, so it was way less. When I switched to the thornbirds, the pressure I ended up using was probably less then what you will be running. the max pressure for the thornbirds was 45 psi. Putting 85 psi in them would have severly bowed the tread, and likely damaged the tire, if not caused a blowout. The tire place put in 50ish lbs all around(discount tire). After the chalk test, I ended up running 30 psi front, and 25 rear. I had a 5 gal air tank so if I needed to take a load of bricks to a customers house, I could just toss another 20 psi in the rear if I had to.
Having your tires properly inflated gives you the best gas milege, best handling, and longest life. If you screw up, you can end up on your roof.
Usually a good guide are the numbers on your door jab. There's a sticker there that has the manufacturer's recommended tire pressures...when the tires are cold.
My car's suggestions are around 30# front/28# rear for the standard 16" tires just for comparison... if the ride on your car feels too harsh, drop the pressure down a bit.
The manufacturer's suggestions are basically an attempt to come to a compromise between ride and handling. Pumping it up to 40#s cold will actually shrink your contact patch and wear your tires unevenly. Good rule of thumb is to have the rears at lower psi so you tend toward understeer, especially under braking. It's safer for the average driver. 99% of people on the road are average drivers or worse... exceptions? People that know motorsports car control.
My car's suggestions are around 30# front/28# rear for the standard 16" tires just for comparison... if the ride on your car feels too harsh, drop the pressure down a bit.
The manufacturer's suggestions are basically an attempt to come to a compromise between ride and handling. Pumping it up to 40#s cold will actually shrink your contact patch and wear your tires unevenly. Good rule of thumb is to have the rears at lower psi so you tend toward understeer, especially under braking. It's safer for the average driver. 99% of people on the road are average drivers or worse... exceptions? People that know motorsports car control.
goodoptics
Platinum Member
Never thought of that. Good advice. Thanks! 🙂
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