Complete the following sentence

Complete the following sentence with a (compound) word derived from the one(s) given in bracket.

One of the tyres of the truck exploded because of （ ）．(over, load)

根据前文，because of可知，空格处应该填名词形式，over超过，load装载，可合成overload过重的负担。句意：卡车的一个轮胎因超载而爆炸。