How much air does it take to blow up a tire? It's probably (not) a question you've pondered, but thankfully, the folks at Vehicle Virgins have the answer. They wanted to find out how many psi it would take to blow up these General G-Max tires on 18-inch wheels. You can skip ahead to four minutes into the video and, after some initial problems, they had to switch tires because the Generals wouldn't blow at the compressors maximum pressure. After finding a used tire that already had some sidewall damage - BOOM - and you have the answer to your question.