Basically, the forces of an explosion. Hot gasses expanding at high speed push the edges of the tyre back on to the rim.
基本上是因為爆炸的力量. 熱氣體高速推擠造成胎緣逼向輪圈邊緣.
The moment there's a seal, the normal airline can take over and inflate the tyre up to it's proper pressure. Sometimes, you don't even have to bother with the airline if the tyres seals fast enough. good luck guessing what pressure you're at though.