trusso

OK so I was walking up the driveway today and noticed a long chain hanging from the spare tire. I never noticed it there before but may never have been looking up at the car from that angle.
Any other 570 owners have about 8-10" of chain hanging from the center of the spare tire?

I'm heading down to the dealer tomorrow to check theirs but just had to ask.

I love the fact that the suspension goes up so high, it made it easy to get under the car to wrap the chain and shorten the "dangle".

ggebhardt

I only have 4-5 inches of chain hanging. Is the face of your wheel facing up or down, towards the ground. Mine is facing up and I feel that it is going to be hard to check or add air as I can not get to the valve without releasing the tire!

trusso

My spare tire (wheel) is facing up also. After I wrapped the chain there is much less hanging down. It just caught me off guard because I hadn't noticed it before.
Remember that your air pressure for the spare is included on the readout (when you scroll thru display on the steering wheel)
Plus I believe the dealership said they will maintain the pressure since it's nitrogen in the tires instead of "air"

ggebhardt

Yes, I am wondering when I got my tires changed from the Dunlops to the MIchelins, did they use nitrogen again. I notice that the indicated pressure of all four tires would go up equally where now after the new tires, the pressure can be off a couple of pounds! I purchased a $70 air gauge and am setting my air to exactly 35lbs front and back (cold) as per instructions from my dealer. Could it be air instead of nitrogen doing this?

trusso

My tires are usually off each other by about a pound at all times. I also notice that from a cold start to a long drive I notice a psi change of maybe 2+- psi. Ask the dealership if they remembered the nitrogen.
I think the dealership said they would maintain the pressure for me as well.
Remember that once you add "air" now that comprimises the nitrogen and you will have more expansion in your tires...(funny enough that it shouldnt matter that much, just that the nitrogen is so cool)

Also, I had a guy in a McLaren SLR give me a thumbs up Saturday when I was driving the 570. I would have traded him if he asked nicely...

ggebhardt

Seeing that our atmosphere is already 80% nitrogen, I have trouble believing all this but there may be some benifits. I undertstand the nitrogen does not get thru the rubber as quickly as air but if that were so after time, I would think you would have nothing but nitrogen in the tires!

I just notice the PSI on the screen being closer before the tire thing. At my next service, I will have them replenish my nitrogen. Wonder how many times they inflate and deflate to purge?

trusso

I thought that the benefit was that Nitrogen didn't react to heat or cold as much as "air". Having nitrogen in your tires will keep a more constant pressure on cold days, also hot days with freeway driving (heat generating).

I looked to Wikipedia and yes, 78% of our air is nitrogen....
So now let me say, when they are charging $50-$75 to "refill" your tires with nitrogen, they are doing a great job.....of marketing!!!!!
That is truly "selling ice to Eskimos"!!!
...OK, just found this too.....they jury is out!!

http://getnitrogen.org/

trusso

On that website, Jay Leno has a video. Now I'm sold because he's Jay Leno. He's just a normal guy like us and a car lover (like when he sits down on the doorsill of his McLaren to chat with us...just a normal guy)
I'll take it in the 570 because it's free. If I can talk them into airing up my GS, Corvette and motorcycles, I'll take it free too.

tigmd99

From what i hear, Nitrogen is not worth it, esp. when you have to pay for it. I would just use air and then check your tires periodically...once every 1-2 months and once at the beginning of every weather temp change. If you guys care about your truck, then this check is a way to bond with it! And since you guys have the air monitoring system, you may not need to be so **** with the Nitrogen crap.

Greg, IMHO, if your new tires are the same size as your stock tires (on stock rims), then you need to stick with FACTORY (owner's manual) recommendations. Those tire shop guys just know one thing...35 psi is good for all truck tires...go ask any garage and they will say the same thing. They are right in that 35 psi won't do any harm to truck/SUV tires and is a good round number to remember. However, for the benefit of your truck and general comfort, i would go with the factory settings. Remember, Lexus engineers spend a lot of time designing your truck air/electronic suspension and tire/rim combo to get it "just right" for the luxury customer like yourself. I would not screw up their hard work based on some tire garage monkey's general recommendation.

Disclaimer: if you upsize or put on heavier duty tires, then you can go away from factory recommendation by a little bit.

ggebhardt

Uhhh, the tire people did not advise me to go up to 35psi, it was the Lexus service people. They have not just told me once but on two occasions.

As far as using nitrogen. . . this has all been talked to death. Not sure if it improves performance but the 570 did come with it installed. Does not mean it is mandatory, it is more a personal preference.

I have waxed my 570 4 times in a little under 6000 miles.

"We" ARE bonded!

trusso

I'm filling mine with nitrous tomorrow.
I'll start a new string when I have results..

BOOM !!!!

tigmd99

Even worst!