Wide tire problem!!!!

[manchild]

The tire can have a biger diameter at the outside edge than on the inside.
So the outside makes more way than the inside.
If you trife throu a corner the difference is balanced.

Than it would always tend to turn inside and that would be a killer on straights and in turns opsite to tyre angle.

It could only work if camber and suspension geometry would always keep tyre in contact with track on the inside or outside edge only, but not both at the same time.

[RH1300S]

Surely we are forgetting the contact patch here? The tyre is not rigid, instead where it meets the road, the contact patch deforms and allows things to happen (generating slip angle). I suppose what you could say is that the effect you are talking about is one of the forces that will deform the contact patch.

[manchild]

Surely we are forgetting the contact patch here?

That is like suggesting that I could forget Sam Fox pic on page 3

[mep]

Yes Manchild it would tend in one direction on the straits, but
don`t forget that you have four weels at a car. One tyre puls to the left
the other to the right and you drive straight.

And you also have a chamber. And this chamber is never constand.
You can arange you suspension in a way that on the straights only a smal
part of the tyre is in contact with the road.
At the corner you have a roll moment so only the tyres on one side have the full contact and help to drive the corner.
After driving trough the corner the roll moment finishes and the tyres get les contact again.

Secondly you always drive on a circle. This means you have for example much more right corners than left corners.
The best example is a oval race. You only have corners in one direction.
At the straight must the driver steer a litle in the other direction but he gets this back at the corners.
Racecars of ovals have biger tyres at one side than on the other.

[Apex]

Ok I think that some of us are forgetting that tyres are made out of rubber and not glass!

As was pointed out the percentage between the radii od the outer and inner is small:
For example with a turn radius of 6m and a tyre width of 350mm the difference is (correct my if i'm wrong) 175/6000 = 2.9%. This can be absorbed by the rubber flex. Watch a toyota and you will see that there are worse problems out there!

To comment on a cone shaped tyre:
If you apply camber to a coned shaped tyre you are in essence counter acting the camber effect.

[pompelmo]

2,9% is a HUGE number for my matter!

[Guest]

To comment on a cone shaped tyre:
If you apply camber to a coned shaped tyre you are in essence counter acting the camber effect.

Not if you design the tire to work with the camber gain. For example, a cone shaped tire that is bigger on the outside will work well with negative camber in the corner to provide a full contact patch. On the straights it would not be as bad as having a normal tire because of the cone shape. Remember, normal tires don't handle large amounts of negative camber very well, so the cone shaped tire is a solution to that problem. And they do make them.

They did this on the F400 Carving Research Vehicle:

And just how does its odd but effective wheel and tire package work? In order to create the largest contact patch possible, necessary for optimal grip, a radical redesign of the cars wheels was necessary. Why? The greater the wheel camber, the smaller the contact patch. Thats why todays sports cars offer nominal wheel travel and extremely rigid suspension systems. The engineers want to reduce lateral movement, especially in the tires sidewall, to a minimum. Think about it. If you tilt a conventional performance tire on a 20 degree camber there wont be much rubber contacting the road, hence the problem. What to do?

DaimlerChryslers engineers rewrote the rule books and developed a completely new type of wheel with two different diameters. The inside rim, which is most in contact with the road when cornering, measures 17-inches, while the outside rim is 19-inches in diameter. The best of both worlds system provides superb straight line stability while offering a much larger contact patch when needed most, in the curves. Interestingly some motorcycle racers have used a V shaped tire to improve the contact patch during high-speed cornering, similarly maximizing the contact patch when leaning the tire. The F400 Carvings tires measure 255/35R19 at their outer edges and 255/45R17 on the inside rim.

[manchild]

Yes Manchild it would tend in one direction on the straits, but
don`t forget that you have four weels at a car. One tyre puls to the left
the other to the right and you drive straight.

Such thing can't work because tyres would overheat and ware-out in a flash with huge amount of rotation drag. Tyre of such shape would tand to turn all the time, two such tires on same axle would tend to trun in oposite directions. The tyres would act like skies on certain angle with front ends pointed to each other and ends spreaded apard - that causes slowing down with huge amount of friction.

All of that together would cause huge drag, stress the suspension, make steering impossible... by me it is out of the question.

Try making a model of this element without the top and you'll see (as high as Y) .