Herride

thought i would check pressure in the RX today for the first time, all checked in at 39 psi, nearly 3 months old, sticker on door panel calls for 32 psi, so it had to come from dealer with the 39 psi, guess i should lower it to the correct amont of air. how much do you with the F sport run in your tires? thanks

corradoMR2

Lexus always sets the air pressure after every service regardless of Lexus vehicle, a few PSIs higher than the recommended and I always drop it for a more comfortable ride. I have it set to 32 - 33 PSI on my F-Sport as 37-38 which I found it at was a little stiff for my liking.

Dawa

iTrader: (5)

the higher the psi, the stiffer the ride yet the better the mpg.
again, a few lbs isnt going to hurt younor anything else really

Sevn86

I run my Michelin tires at 35 psi. I don't have the F-Sport btw.

dctex99

Same here, and the opposite; I run my Michelins at 35, but they will be 32 when I get it back after 10K service!! My dealer is very thorough!!

BertL

I also don't have an F-Sport. The sticker in my RX450h recommends 33/33 PSI for my 19" Bridgestone Dueler H/Ls. I'm running them at 40 -- well under the maximum PSI rating on the tire itself. While the combination with my 19"ers it's a bit more jarring if I don't slow down enough over bumps in parking lots, the overall "tightness" of my ride is what I prefer after playing with it for the first several months of ownership, and if it improves my mileage to-boot, well, that's great. FWIW, when I took my RX in for it's 6-month maintenance earlier this year, my service advisor told me they started bumping up PSI on tires like mine last year to 40 as well. That's how mine was delivered back to me after service.

OP, even with just 5 posts, you can see we have lots of opinions. My suggestion? Try bumping up the PSI a bit and see how it feels, then settle in on what is best for you. Like some of us, you may find this change is one of the more dramatic things you can do effecting the feel of your RX on the road.

Herride

yea took them down to 35 psi

Dolphin

7 lbs over, and the sensor did not indicate this to you?
Is tire pressure indicator only for low pressure? How low?

lexu1350

When we got the rx 350 with stiff ride,with 39 psi all 4 tires drop it to 32 i what a difference,but that bridgestone
had tire nois,will replace it with a different brand when time come's.

BertL

Each time I have played with a different pressure, I reset TPMS with the little button way back under the dash near the steering column, so "my standard" becomes it's new normal.

sweetboy02

About 17 - 22psi you will see a warning indicator.

kitlz

I had TPMS go off at 31 so it's best to reset it when making any adjustments like BertL said. IIRC it happens when the difference is around 7-8 from last reset to current pressure. So if you reset your TPMS at 35, the warning will come on when the tire pressure drops to 27-28.

Currently I have around 34.5 in the tires of my 450h with the sport suspension and plan on lowering it a little when it warms up. BertL, my SA who owns an RX herself said to keep it around 35 but 40, wow!

Droid13

There are many, especially in the hybrid community, that believe tire pressures should be set to near the maximum a tire allows for the best fuel economy and even handling. I've heard of people running mid 40s to almost 50 if it's within the tire manufacturer's recommended limits. Although not universally agreed, the theory is the lower "vehicle" manufacturer recommended pressures are simply catering to people's behinds and not vehicle performance.

I tried running my old Camry Hybrid for a while near 40 to see if it made much of a difference. In my case, I found it minor and the Camry's suspension was already a bit harsh so I settled around 35. In my case, my trips are short and warm up time has far more of an effect on my FE compared with what might be possible with high TPs. On my current ride, I've stuck to the recommended 33psi for 19s.

Dolphin

OK, would someone like to advise me where this reset button is.... unique only to hybrids? can't find it on my 350 anywhere near the dash / steering column?

BertL

Get down on hands and knees and look back and up under the dash in the footwell of the drivers side. You may need a flashlight. Not simple to find, but you will.

There are some long discussions on the search for the TPMS reset button around here somewhere too, if all else fails. ...so don't feel bad if it takes some looking. Good luck!

...to save you hunting, I just went out with flashlight and looked again for you... I think your 350 is likely the same as my 450h, but on my 450h, get down on hands and knees. Look towards the center of the truck in the drivers footwell, behind the light for your feet, towards the firewall. On the black and somewhat flimsy extension of the dash, there is a round button inset in a rectangular area. That's it.