What is the optimal tire pressure for the HMMWV when operating off-road?

The optimal tire pressure for the HMMWV when operating off-road is typically around 20 psi. This lower tire pressure provides several advantages in off-road conditions, such as improved traction and increased surface area contact with the ground. By reducing the pressure, the tire expands and "floats" better over soft surfaces like sand, mud, or gravel, which helps prevent the vehicle from getting stuck.

In off-road situations, maintaining appropriate tire pressure is crucial for ensuring the vehicle's performance and handling. If the tire pressure is too high, the tire can become rigid, leading to decreased grip and potential puncturing. Conversely, too low of a tire pressure can result in rim damage or tire bead separation. Thus, 20 psi strikes a balance that enhances stability, traction, and overall maneuverability of the HMMWV under challenging terrain conditions.