I have 4 225/65/16's on my car and they say 45 psi's. Just wanted to know if I should fill them to that exact amount or a little under or over.

Thanks

 

Do NOT fill your tires to the PSI listed on the side of the tire. That is the tires max inflation. Open the arm rest find the psi Nissan recomends and fill accordingly. You can go up but not down. I run 35 lbs in my front tires even though stock is 33 lbs.

 

But mine are not stock tires. They are aftermarket labeled 45 psi's and if that is the max inflation on the side of tire, then why do you put more than the max amount of air. 33 Maximum and you have 35 in there right?

 

Ok where to start. The more air you have the harder the tire. duh This is good and bad. On smooth road the car will feel better...the side wall will not flex and less rolling resistance. Now realaity smooth road where??? Since you have lots of air in the tire the tire it will not flex as much and you will loose traction with the road. Don't believe me...go around a curve and hit a bump and feel that back end hop. Also you will get one crappy ride at 41lbs

I run 35 lbs in the front tire 1) to firm up the tire (less lean) 2) adjusting the front/rear with plus or minus 2-3 lbs you can change the under/over steer of the car slightly. You will not get the dramatic change you get with a RSB.

Stock or not you do not fill to max. Once the tire heats up you are over max. Think about it then I should be running my Z at 51 lbs. Man would I feel every little thing in the road.

 

As said, you don't want to start off filling them to the max PSI.

225/65-16 is a really WEIRD size, so I would consult a tire shop or the place you bought them to get a PSI suggestion to start at. They have charts for this so you should do this anyway even if that size is a typo...

 

that is not a good size to be running, I bet your car is feeling slow with them on. 225/50 16 is what you want.

 

thanks for all the help guys. I wasn't sure before but now I have a good idea.

 

R U sure you have 65 series tires and not 55 series?? I mean, like...what do u normally do with your car that it needs that much additional ground clearance? Is it like a safari wagon?