The one word explanation is "Explosion". Actually last year Car and Driver US has an article talking about this.
How To: Set a Tire Bead with an Explosion
Keep your eyebrow merkins and medicinal salves at the ready. BY K.C. COLWELL
When off-roading, it is customary to reduce tire-inflation pressure to enhance grip. This practice also increases the possibility of instant and unwelcome tire deflation due to an accidental loss of bead-to-rim contact. Reseating the bead usually requires a tire-mounting machine. But there is another way to accomplish this, a very dangerous way involving a combustible liquid, some means of ignition, an explosion, and possibly burning human flesh and/or acute embarrassment. You’ll notice that the instructions below are written in an expository fashion, as if we expect you to perform them. We do not. If you choose to, that’s on you.
STEP 1. Jack up the vehicle so the deflated tire is off the ground. If the wheel-tire assembly is removed, lay it flat.
STEP 2. Depress the tire sidewall to expose the center portion of the rim. Spray a flammable substance (starter fluid works well) inside the resulting cavity. There’s no need to saturate the tire or wheel; like habaneros, too much starter fluid can have a devastating effect on your well-being.
(Note: Any flammable liquid will work, including gasoline, but using that would just be stupid.)
STEP 3. The goal of this step is to ignite the flammable liquid on the wheel. This can be accomplished by throwing a lit match at the area, touching the area with a fiery torch, or—if you’re daring (and by daring, we mean an idiot)—creating a makeshift flamethrower by lighting a spray of starter fluid with the ignition source of your choice.
STEP 4. Get it right, and the gases will ignite. The rapid expansion of burning gases (also known as an explosion) will spread the tire sidewalls and reseat the beads on the rim surface. Any inkling of self-preservation you possess will cause you to reflexively flinch away from the blast. Try to compose yourself quickly, though, because the explosion usually overinflates the tire.
STEP 5. Bleed excess pressure from the tire. Be careful; the escaping air may be hot. It would be bad form to get this far and then burn yourself.
STEP 6. Accept praise/emergency medical attention from onlookers. Note: If you brought eyebrow merkins, this would be the appropriate time to affix them.
STEP 7. Continue to enjoy life or carry on off-roading.
The chemical expand after the burning process and fill between the tire and the rims. They will need to release all the chemical afterward and re-pump air in. This may damage the tire wall due to sudden expansion and for sure it will not do anything well for the balance....
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發表於 2012-8-24 17:22:00
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發表於 2012-10-24 15:21:26
