I tried a search but it won't work. Anyone know the corect PSI? My front tires seem low. Thanks.

 

If you still have the OEM tire size, look at the sticker under the center console, the info is in there. As a rule of thoumb though, 15s should be about 30, 16s about 33, 17s about 35 and 18s about 37

 

Correct method is to fill air to the MFR specs ( owner's manual) It doesn't matter what brand tires you have.

 

look on the side wall of the tire. i have kumho 235/40/zr18 max PSI is 45

my PSI is 35-40 psi depending on what i am doing..IE roadtrips/weather

 

Read the sidewall more careful. The max PSI is at a X load. Do all the cars with the same size tire weight the same?? I think not.

 

This guy knows what he's talking about

 

About time someone else here realizes the side wall is NOT the pressure that you should run. Thank you 1max2nv!!!

Read the car manufacturer specs on tire pressure for YOUR vehicle and run them at that pressure. Always check your tire pressure when the tire is COLD. Early in the morning is best, prior to driving.

 

A few notes on tire pressure. Running a tire with more pressure then the vehicle calls for can actually reduce handling and produce a hard ride.

Higher tire pressure will actually reduce the contact patch of the tire to the road. This could cause excessive hydroplaining in wet weather and reduce your tires performance on dry roads as well.

Yes we all like the harder ride, but you are not getting any more traction this way. You will actually lose traction more suddenly when you reach the tires limits. When that happens, your in trouble.

I think the Dunlop web site has some good information concerning this topic. It actually shows the contact patch of tires which are over inflated and under inflated and the results of such.

Be smart, drive safely and always keep your vehicle maintained correctly. I think I read somewhere that 1 out of every 4 cars on the road have low or incorrect tire pressure.

 

29 for the front, 32 for the rear.

 

see i learn more everyday. i did not know that. thank you.

 

You got that switched around. It's 32 front, 29 rear. The front is heavier, thus higher pressure to compensate for the load.

 

I think medisonic had it right.

I have the 18s, and they shop recommended psi of 36-37.

 

These are good numbers to use. While you can run manufacturers specs, I would use the numbers listed above. For your info, I have 235/45/17 and run 36 front, 33 rear.

 

You don't have to worry about being exactly at whatever pressure you decide, a pound either way isn't going to make any noticeable difference on the road. On the track it might, but on the road it really won't. You have to take into account the recommended pressure for the specific tire, your car's weight, and your driving habits and preferences. I run 38lb front and 35 back because I enjoy the increased turn in response that the higher pressure gives.

 

It all depends on the tire compound and construction. Some tires work better at lower pressures, others work better at higher pressures.

Lower tire pressures in a street compound results in a larger contact patch but it also increases tire pressure after it's heated up and it increases sidewall deflection.