Just a friendly reminder to all here that as temps drop so does your tire pressure. I checked mine today and found all 4 down 5 - 6 PSI. Your tire pressure should be checked cold, first thing in the morning, before you drive.

Drive safe, be smart, enjoy your ride and keep your cars maintenance up.

 

Awsome reminder, didn't know that info!

Now heres a newbie question, with aftermarket 18" tires, 235/40/18, whats is the psi supposed to be?

 

thank you for the reminder tom but it's still kinda hot in CA...i'll adjust my tire pressure in november....

 

I keep a pressure gauge in the glove box at all times.

and while youre at it check the level of fluids, (oil, brake, clutch, coolant, tranny) its never a bad thing. you cant be to safe with stuff like this.

 

great info! just a quick question: what's the psi on 225/55/16? is it still 33psi?

 

I run 35/f and 32r on 235/45/17 profile.
Never had a bump or pothole ruin a rim or tire.

I think Nissan tire PSI on OE size tire for an SE is 33/f and 29r.
Somebody correct me if I'm wrong.

I like to run low profiles just slightly higher for rim protection.

 

235/40/18, what psi should i run?

 

oh and check your spare

 

i'm running 35psi all around

 

32 front 29 REar for my stock 5 spoke on my 99

 

my tires are kinda wide for the 16's 225/55/16 (on 2000 5 spoke rims) and they always look like they are deflatated on 33psi... and my gas mileage is killing me 18mpg, i changed fuel filter, air filter, cleaned throttle body, changed spark plugs, changed KS... still cant bring it up... should i add more air into the tires? (on the tires it says 44psi maximum)

Thanks
Sergei

 

Sure, try it and see if that helps. Maybe 40 psi. If you have really performance oriented tires though, you can only do so much. Check other factors that might influence milage though....

 

Definitely add more air if you want better mileage...it sure as heck helped me.

In addition some places use nitrogen (such as Costco) to fill their tires...nitrogen is not affected by temperature and so this rule wouldn't apply to those who use it.

 

Ever heard of liquid nitrogen? The density/pressure of nitrogen, like any other gas, is indeed affected by temperature. I can't believe it would be much different than plain air, since air is 80% nitrogen.

 

costco fills tires with nitrogen so temp really isn't an issue...

but thanks for the reminder!

 

Air is 78% composed of Nitrogen. However a lot of it is "dirty" and filled with water molecules as well as other gasses. Under colder temperature, water condenses and you lose pressure.

Typically nitrogen is made on site by removing volitile gasses like oxygen, hydrogen, etc. It is usually around 95% pure and the room for expansion/compression under temperature change is far less than typical air filled tires.

 

thanks for the replies, i will try to fill it up tomorrow to 40psi we ll see if it helps


Sergei