Anyone remember the nationair DC-8 crash in Jeddah a few years back caused by an under inflated tyre exploding in the wheel well after it had taxied approx 5 miles then took off? I can not remember the % of under inflation but it was large however visually no difference could be seen between the low tyre and others the only way to check is with a gauge or EICAS, if you are lucky enough to have one.