“Bulletproof” isn’t actually a thing: it’s a colloquial term for ‘bullet resistant.’ “Bulletproof” isn’t actually a thing: it’s a colloquial term for ‘bullet resistant.’
A big enough bullet, or a bullet moving fast enough, will go through anything.
The goal when making ‘bulletproof’ tires then, isn’t to make a tire that no bullet can penetrate, but to make a tire that will stop some bullet, and remain effective if hit by larger ones.
There are actually many ways to do this, depending on what the tire is going to be used for and what size of bullet it is intended to protect against.
Thick, strong rubber will actually deflect many small caliber rounds unless they hit the tire at a steep angle. Think of a ricochet – the bullet will glance off. Larger bullets will penetrate the tire, which leaves us with three main options:
• Self-sealing tires, which are built in such a way, or contain a material which will seal the hole left by the bullet• Systems which will pump air into the tires to keep them inflated• Systems which allow the tire to function without air.
Self-sealing tires have a thick, viscous layer which will flow into and seal holes made by bullets or spikes:
There are many systems which allow air to be pumped into tires while the vehicle is moving. Some rely on onboard air compressors, such as those found on tractor trailers:
These pump air through the hub, and then into hoses which lead to the tires.
A more sophisticated system actually uses air pumps built into the tires to maintain air pressure:
In Goodyear’s system, bladders in the tires are equipped with check valves which allow them to draw air in and pump it into the tire when the pressure drops.
There are many systems which will allow tires to operate without air. A solid ring can be placed around the rim to bear the weight if air pressure is lost:
Source:https://www.quora.com/How-are-bullet-proof-tires-made/answer/Courtney-Ballard-2?srid=3WgWl
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