ToyotaLexus

Do you guys follow the Lexus-recommended 30psi for your tires?

Just checking... thanks!

TunedRX300

No, because Lexus does not make tires and never will be able to test each model (past and present) with every single tire offers by all tire makers. 30 psi is just a rule of thumb.

salimshah

Nothing magical about the pressure ..

Compromise among road-grip, ride comfort, fuel-economy.


Sweet spot for me is around 32psi.

Salim

mitsuguy

iTrader: (2)

just add weight carrying capacity, and you're golden...

tcheung87

I'm running 34psi all around, I feel that it rides significantly better and more confident.

zombie

iTrader: (1)

i put around 35psi. 30psi makes my tires look flat.

Lexmex

Rolling at 39 psi out of 44 max on 235-70-16 Crossterrains with nitrogen.

salimshah

Are the roads much better than what I imangine? Seats provide cussion but do you get rattles?

Salim

Lexmex

There are nice roads down here, but sometimes they look like this in Taxco (the silver mining town).

ToyotaLexus

wow.... is it really safe to pump the tires up to 39 psi?

The most nitrogen air I've pumped into my CrossTerrains is around 32 to 34 psi... and the Costco tire guy really didn't like that...

Lexmex

Good question. As far safety that is up in the air, but as far as performance (gas mileage, too).

Let me relate something from my racing experience, actually the first time I took my RX over to the track down here.

First time I ran it was a 19.6 or so, stock.

One of the minor adjustments I made after that as adjusting the tire pressure from about 33 or so up to about 37.

Now, I did do a coupe of other things like ditching the air filter, wrapping duct tape around the middle of the airbox (where hot air might sneak in), lowering how much I put in the trank from about 1/4 to 1/8 a tank, ditching the spare tire, jack and turning off the headlights.

Next time I ran, down to 19.2.

I did further testing and tried it higher like at about 42 or so.

Now, the tires jumped when hot to about 43 psi, but the RX could not get good traction and I could feel it seems to slide or skip as I went down the track, and lost about a .1 of a second or so.

Now, about this time of the year, I find 39 psi just fine (cooler), whereas maybe a 38 in hotter weather, (would go up to 39 psi when hot), would be just fine.

HarrierAWD

I think that the ideal tire pressure depends on the tires and your personal taste. After some trial-and-error, I did 33/31 (front/back) with Goodyear Integrity, then 32/30 with Bridgestone Dueler D687.

Now I'm experimenting tire pressure with my new Goodyear Fortera Tripletred. The sweet spot seems to be 31/29 for now. My gas mileage improved from 22.8 to 24.3. The ride quality improved, too.

Agree that 30/30 makes the front tires look flat. And it makes no sense since the RX300 is front heavy (57/43).

ToyotaLexus

how do you like those Goodyear Fortera Tripletred tires?

Thanks!

Fern

I disagree,

the tire pressure is specified by the car manufacturer due to ride quality and engineering characteristics developed with the suspension.

Presuming you are using the right spec tire for the car, always use the tire pressure indicated on the inside of the driver's side door.

Some car manufacturers even go as far as having multiple tire pressure levels suggested due to different load capacities the vehicle might have, ie:
when carrying 4 passengers or 2..

My old Pathfinder had a 26 psi requirement which I couldn't figure out until a suspension specialist said to use the specified psi due to handling characteristics designed into the stock suspension.

Its 30psi for me all year round with the RX

miniround

i run 35psi...max of 44...as someone said 30 makes my tires look flat.

although, when i get my wheels i think i'm going to run on nitrogen...