How to weight your car!!

Hate to poopoo this, but....

My brain keeps telling me that the fatter the tires are, the more my car will weigh if I used that method.

Find me a 2666lb minivan or station wagon, whatever that was.

I think not. Tire pressure being equal, the width of the tire should only change the dimensions of the rectangle footprint. instead of being more squarish, it would be a short length rectangle with a large width and still have roughly the same area

The point of the wider tires, I beleived, was just to have a wider contact patch.

Someone please correct me if I'm wrong

Oh and its neither a minivan or a wagon, its a Puegot, a tiny french car. That means it has all the style of a minivan with none of the useable size :rolleyes:
 
I think not. Tire pressure being equal, the width of the tire should only change the dimensions of the rectangle footprint. instead of being more squarish, it would be a short length rectangle with a large width and still have roughly the same area

You're right. This is why a wider tire will hydroplane quicker. It is a common misconception that wider tires actually give you more surface area touching the ground.

That said, I'm still left pondering the accuracy of her method. I can imagine there are a lot of variables that could throw your calculation off.

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The diameter of the tire also affects the size of the contact patch...

Which car is heavier? 205/50/15 or 245/45/17

I can tell from experience which one has the larger contact patch, too bad I'm too lazy to go out and swap tires around and measure things.
 
The diameter of the tire also affects the size of the contact patch...

Not true. Think about it and do some research. Why do tractor trailers have so many tires? To distribute the weight, right? If your theory were true then they could simply run larger tires and distribute the weight across a larger contact patch.

The diameter of the tire affects the shape of the contact patch not the size.

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grrr, since all my misconceptions have been poked at now, I had to do some research...

Surprisingly to me, it looks like the method in the video should be reasonably accurate.

I guess the width and diamter of tires is all about reducing deflection under a load and doesn't really affect the contact patch while static.