If a motorcycle tire goes flat while riding, what should the rider do?

When a motorcycle tire goes flat while riding, the safest course of action is to gently apply the brake of the non-flat tire. This approach helps to maintain balance and control of the motorcycle during a critical situation. Applying the brake on the flat tire could exacerbate the loss of stability, making it difficult to manage the motorcycle and increasing the risk of a crash.

Gently utilizing the non-flat tire's brake allows the rider to slow down gradually, which is vital for safely pulling over to the side of the road. This method helps to keep the motorcycle upright and manageable despite the flat tire, ultimately leading to a safer stopping process.

The other options would not ensure the safety of the rider or the motorcycle. For example, increasing speed to stabilize the bike could worsen the situation and lead to a loss of control. Similarly, pulling over immediately without any controlled braking could result in an uncontrolled stop, increasing the risk of a tumble or accident. Thus, gently braking and focusing on safe stopping is the best practice when dealing with a flat tire while riding.