re: "Google Wallet may be making a return" (and "Why is it so complex

The gov cares about passenger tire underinflation accident reduction.

The gov scoped their passenger car tire nitrogen study fifteen years ago.

This is a 2008 NHTSA report on nitrogen in passenger tires that resulted.

The Effects of Inflation Gas on Tire Laboratory Test Performance

Too technical for me. What do you make of that gov study on a 95% nitrogen mandate in car tires?

I want to try nitrous oxide in mine.

Ha! It is to laugh!

Wow. Basically everything drawn onto this image is wrong.

You're showing a car that is clearly up on a jack on the side we cannot see to simulate the car rolling in a turn...

...but you're showing it rolling to the INSIDE, when in FACT...

(You remember you're all about "FACT", right?)

...cars roll to the OUTSIDE when they turn.

The inside tire in a turn typically rolls MORE than the car rolls as the suspension geometry is usually optimized to make the camber of the more heavily loaded outside tires as favourable as possible.

And while it is true that the inside "corner" of the inside tire will be the part that is more loaded (and SOME of the tread near the OUTSIDE) might be off the ground), the load is less, so it doesn't matter that much.

Sorry, but that wear pattern does NOT represent that the car is "well maintained"

This doesn't inform very much but at least it's not a complete clusterfuck.

Mountains make absolutely NO DIFFERENCE in how a tire wears.

You are a perfect exemplar of the old adage:

"Better to remain silent and be thought a fool...

...than to speak and remove all doubt".

If you're feeling down, get out your balloon!

Do you know why twisty mountain roads cause abnormal tire wear on the outside edges of the front inside tire on tight turns or not?

The only solution for an otherwise properly aligned wheel is to lessen positive caster which decreases the increased camber on the tight turns.

When replying write in your own words what you understood of what I said.

Lewis has _never_ even once in his life ever read Consumer Reports.

Why? I don't know why.

I suspect Lewis gets _all_ his information from marketing advertisements. Instead of from reputable outfits.

Like Consumer Reports is.

FACT: *Should You Use Nitrogen in Your Car Tires?*

That link supplied to the government PDF is a nice find because it shows NHTSA found no practical advantage to nitrogen in tires, just as CR did.

It's a gimmick.

More to the point, only people with abnormally low IQ fall for paying extra for air that has a visible green cap but which has no practical value.

Tight turns might cause wear (nothing to do with it being on a mountain)...

...but they won't cause it on the outside edge of the front inside tire...

...as that tire is only lightly loaded (load transfers to the outside tires when turning)...

...and the outside edge is the least loaded portion of the least loaded tire (see below for why).

Typical values for caster on a road car are about 3-5 degrees. Even at 5 degrees and a steering lock of 45 degrees, the camber gained is:

0.55 * 45° = 2.475°

So if your tires are at -1° static camber (a typical value), the camber will go to 1.475°...

...only if your car doesn't roll to the outside at all.

If it rolls to the outside as a car ACTUALLY DOES, then the tire will probably still have negative camber.

And then there's the fact that small values of camber don't actually cause much (if any) tire wear.

For what its worth, using nitrogen in tyres is just another way to suck people into a *regular subscription payment* when they top up their tyres.

More likely to get the sharpest turns on a mountain road.

Nothing to do with load transfer. Effect occurs even at low speeds.

Think about KPI/SAI and its effect on camber in turns. You are only thinking of camber gain in bump and/or rebound.

It doesn't help the tires but it helps the tire provider's bottom line, or they wouldn't bother to do it.

BTW, what did you think about the claim from somebody that steep twisty mountain driving doesn't wear tires any more than driving on flat roads does?

Does weight transfer to the front tires on a steep downhill turn have a compounding wear effect over and above the increased camber based scrub radius on the inside tire outside edge on those tight turns?

Since kingpin angle (like castor angle) contributes to wheel camber increases with increasing steering input at any speed or inclination, do you think a slight decrease in positive caster might lessen the inevitable camber scrub effect on the outside edge of the inside front tire on tight turns?

Would the drawback be decreased stability on the bumpy level straights?

And?

Let's speak accurately.

You've yet to demonstrate that the effect exists at all.

Nope. You are utterly wrong.

I'm talking about all things that affect camber.

Look: I've been into vehicle dynamics for more than 40 years and have an actual racing car where questions of camber gain are far more than academic.

Define your terms.

What is "increased camber based scrub radius" even supposed to mean?

First demonstrate that any such effect exists.

The person I was asking already explained it to you as he's aware of the effect that with a positive kingpin angle the outside wheel in a corner will gain positive camber and the inside wheel will lose positive camber.

Let him answer the question.

No. It isn't, so I couldn't miss it.

But if you think the explanation is in anything provided so far...

...just quote it and provide the reference.

How could you keep missing the answer when it was explained to you multiple times by multiple people?

It was explained to you by someone else already and it's in the explanation of front tire wear on the outside edges that you already were to have read.

"When the camber setting becomes positive, the wheel tilts, putting more pressure on the outside shoulder of its tire. Over time, as rubber scrubs off faster on the one edge, the tire develops uneven wear."

I'm done with wasting my time with you if you can't get it after being told three or four times.