Can anyone please tell me how many pound I should pump my Michellin Pilot Sport A/S 235-50-17 on my G35 2004 sedan? I am at around 44 pound and the ride is so bumpy, thanks.

 

44 PSI???? That's waaay too much. There should be a sticker Inside the passenger door with the recommeded PSI. I have 235/45/18 and I put 34-35PSI when cold.

 

Thanks mk3gtr, can I go by the recommended PSI even my tires are not OEM size, Please advise, I will try 35PSI and I bet the ride will be a lot better,

 

You should be fine around 35 psi. 44 psi is way overinflated.

 

True but that sticker pertains to the stock tires which he does'nt have. I'd say about 32-35 myself. Be careful that the 44 you put in it isn't max pressure.

 

From a bad experience I had this week be VERY careful with the tire pressure thing, turns out that the VDC is very touchy and the car is down right dangerous if the TP is off. Keep in mind the IDIOTS that put my new rear tires on had 80+ friggin lbs in the left rear. Anyway I run 34 in my 235/40 19's front & 255/35-19 rear and it seems to be perfect.

 

44 psi is the max pressure of your michelins and you should only have that in there when you have a load that is close to the max load on the tire (almost never). any where from 32-36psi is gonna be good. The more air you put in the stiffer the ride and vice-versa.

 

35 is perfect.

 

I really appreciate the helpful info from you guys, no wonder my ride was so stiff and I thought something else is wrong, I will go ahead try 35 PSI,

 

Yikes, no wonder the ride is "Bumpy"..... too high bro, even for non OEM sized tires.

30-35 psi should do, depending on your taste.
On my Sedan, 30 was too soft for me...I preferred 34-35 psi.

G/L

C.

 

Yeah, I was told by the detailer to keep it around 35-36.

 

OK, I lower the PSI to around 35, it is not so bumpy n e more, Does my steering wheel suppose to feel the road conditions from the tire, the steering wheel vibrates a little bit, Is it normal to get a little shakier from the steering wheel on ultra high performance tires than grand touring tires? It really depends on the pavement on the freeway, nowadays, highways/Freeways are not as nice as they used to be.....I felt the vibration on Freeway 10 from Morongo to Ontario, I am little confused, please help...

 

I've also got a Beemer 325Xi that has tire pressure of 38 front & 45 back. Go figure. WTF?

It ain't that "35" is too much for any tire.

 

JimeG35,
If you really have to get upset for posting a message, you don't have to,

 

There should be a sticker on the inside of one of the rear door jambs that provides the recommended tire pressure. I run my tires 2 psi (pounds per square inch) higher than the 30 psi Infiniti recommends.

The 44 psi "maximum" tire pressure found on the tire's sidewall is just that... the maximum pressure the tire can handle under maximum operating load and heat conditions. Your tires should never exceed the maximum cold inflation pressure branded on the tire's sidewall.

Running high pressure cause the tire's tread to wear in the middle of the tread. Low pressure causes the edges to wear. Neither is a good situation.

Here's a couple of links that might help you out.

http://www.tirerack.com/tires/tirete...e.jsp?techid=1

http://www.tirerack.com/tires/tirete....jsp?techid=72