Outdated Really Big Tires 1.9.4

I hated how the 100-inch crawler tires would not deflate, so I decided to do some math and figured out how to make them not only deflate, but also not explode with 20 or more PSI!

While I was at it, I also adjusted the values for the 42 and 48-inch crawler tires, which helped them align with the official tires more closely.