The G Man

Hello everyone, our 1st NX300 here, nice little luxury suv. What is everyone putting in their tires, 32 psi seems low to me, I have 19” tires. I set them to 36 psi for all the pot holes in new england. Also, do I have to reset the tpms after I change the tire pressure. Thanks.

bob67

Keep my NX F-Sport at 33psi. 36psi too bouncy for the F-Sport suspension for me.

The G Man

Thanks for the response, I thought the ride was a bit stiff as well, I lower it 34 psi and will report back..

nigel821

iTrader: (2)

I have 33-35psi in the tires. By time they heat up they are at 37ish. When my wife bought the car new, they had filled the tires to something like 44psi cold. When they had heat in them it was 48ish. It was WAY too harsh of a ride.
Lowering the psi greatly improved on comfort.

-Nigel

The G Man

Good to hear lowering psi improve the ride, not all cars do. I am also wondering if those oem conti tires ride rough as well.

Danny200t

does anyone how accurate the tire pressure on the display is? it reads 3 psi lower than my tire pressure gauge so i’m not sure whether it’s my gauge or the car is off

The G Man

Mine is 2 psi off and its a $40 gauge so I know it is right. I am going by my gauge and not the tpms.

DampDuffer

I have two digital tire pressure gauges, and both agree exactly with the F-Sport's TPMS display whether the tires are cold or hot.

My tires are Michelin, and I prefer the "firmer" ride of 36psi cold, which I've seen rise to 40psi after summer highway driving.

I've tried the "softer" ride of 32psi cold, but prefer the perceived increased mountain road cornering performance of 36psi.

Danny200t

I put 37 psi in my 20’s, and i’m running pirellis. The ride with 32 psi is nice and soft but when accelerating the car feels like it’s struggling to get going and the steering is not as precise. I’ve had these tires on for 3k kilometres and not sure if the higher pressure would affect tire wear

ukrkoz

What's wrong with 32? Why did you decide it is low? Also, why did you decide that higher pressure, what = stiffer tire - will help you with potholes? All you accomplishing is transferring more impact into suspension and body. Sure, you may get a bit better mpg, yet it will cost you down the road in suspension damage. If you really want to employ tires for road dampening, use touring class tires with softer wall.
Either way, by the book, tire pressure should be adjusted per load carried by the vehicle. You load 3 average Americans, you just loaded 600 lb. Then you need to pump tires up. Tire pressure recommended is for the vehicle weight and driver.

ssn571

I go exactly by the door jam. I'm not particularly original when it comes to factory specs.

The G Man

I ran 40 psi on my last car due to the 30 profile tires but the center treads was wearing much faster then the outside one. Needed new tires at 25000 miles.

nigel821

iTrader: (2)

According to Lexus user manual for 2018. Pictures attached.




-Nigel

The G Man

Does anybody run their tires at 32 PSI, how is the ride, handling and rim protection. After I adjust the PSI, do I need to reset the TPMS?

nigel821

iTrader: (2)

32psi is going to give you a softer ride depending on what you had them at before. Like I said above, I have ours set to around 33. The dealer had them way higher and the ride was harsh, I was actually surprised when my wife gave me a ride in the lexus the first time. First words out of my mouth were "this is a harsh/bumpy for a lexus...". Mind you the stock tires that come on this suck. They are awful so that will also play a huge part in ride quality. This isn't a performance vehicle by any stretch of the imagination so negative handling shouldn't really be noticed during normal driving by the majority of people. If you had it on the track (why?) then you'd probably notice it compared to if the tires were inflated to a higher psi. Rim protection? 32psi isn't going to protect/not protect anything. That's more on the thickness of the tires. You shouldn't have to adjust the TPMS at all. I know when I lowered the psi I just simply turned the car back on and it read the new tire pressure. IF it complains then you'd just do a simple reset in the cluster.

-Nigel