This is a "duh" post for most on this forum, but I still want to point out the importance of keeping our tires properly inflated on the 2nd Gen platform. Over the last couple of weeks my IS350 felt a little off, especially when freeway driving. I hadn't checked the tire pressure in the last couple of months. Yesterday while I was checking the fluid levels on my other cars, I also added tire pressure check to my list. It turned out the driver side tire was down to 33 psi and the rear tires were 35 and 36 psi respectively. I inflated the fronts to 35.5 psi and the rears to 38.5 psi, and now everything is back to normal! I'm guessing that the staggered configuration makes it more important that tires are properly and evenly inflated, as I don't have this issues with my other cars unless they are way off

 

Everyone can take this with a grain of salt but the name plate pressures do not work for my usage and setup. Not to discount the post above, as pressures matter and Yes they need checked especially when the seasons change. If interested, read on...

Those name plate pressures lead to:
Inner and outer wear up front. The pressure is too LOW!
Center wear in the rear. The pressure is too HIGH! Especially if running around empty like mine does.

Give it shot... Even if not on a stagger but suffering edge wear up front, bump the pressure..

My stagger:
Front: 38 to 40 PSI
Rear: 34 to 35 PSI DD. For road trips/high speed, bump them to 36/38.

JM2C if you want 40k mi from the fronts.

 

For sure I think the pressure up front listed is too low, so I've bumped mine .5 more, but bumping it to 38 or 40 is easy enough. I think we've talked about this before, they are trying to soften the ride on low profiles by lowering the pressure at the expense of tire wear

 

I checked my tire pressure a few weeks ago and they were down to 27 and 28. I pumped them back up to 37 and 38. I know the front should be 35, but my front tires last much longer with 37.

 

Over the life of say 40,000 miles, this matters (a few PSI). Sadly, a lot wear can happen at lower pressures and then the damage is done. No take backs.

 

************

 

This is what happens when you put 38psi in your back tires.

 

Exactly what I'm saying! The wider the tire, less pressure or the center gets blown away!

^^ How many miles??

 

35 psi in the rear tires it is!

 

I did this for my rear dropped to 35 since the outer tire has more life than inner, and huh I did notice outer tire wear for my fronts and they are set at 35.... I assume it needs more like you say?

 

this is what my rears are starting to look like too, I did lower the pressure a few months ago so that helped prolong the inevitable. I have about 12k+ miles on my falken fk510s.

 

I don't have problem like that on the rear tires with pressure at 38.

 

Thats also what I'm saying, driver use and style matter. The moment one inadvertently spins up an overinflated tire, boom - center is gone. Is it fair to say that rarely if ever happens to your vehicle?

 

Well at least we know who the people are that are doing burnouts

 

I am suggesting this... Yes!
Some of us have the RC-F LCAB to firm up response and partially mitigate inner wear. Now it's up to tire pressure and toe settings to do the rest as wear on both edges is tire controlled by inflation pressure but induced by excessive scrubbing as the tire rolls onto its edges. Mitigate by increased pressure AND toe it in ever so slightly if the dominant wear is inner edge.

5 years in the frame and alignment business doing everything from farm trucks to exotic sports cars to travel trailers. We did all the vehicles others failed to fix...