What happens when the rear tire of a motorcycle goes flat?

When the rear tire of a motorcycle goes flat, the most likely outcome is that the back of the cycle will jerk from side to side. This occurs because a flat rear tire significantly affects the motorcycle's stability and balance. The rear tire plays a critical role in maintaining contact with the road and ensuring smooth handling.

When it loses pressure, the contact patch changes, and the motorcycle can become unstable. As the tire flattens, the rider may experience difficulty controlling the bike, leading to swaying motions or jerks as the rear tire struggles to maintain grip. This instability can be quite pronounced, especially at higher speeds or during turns, making it essential for riders to be aware of their tire condition and to address any flats immediately for safety.

This phenomenon contrasts with the other options, each of which describes different scenarios that do not specifically address the consequences of a flat rear tire. For instance, acceleration and brake effectiveness are not directly impacted by a flat tire in the immediate sense as the primary concern is the handling and control of the motorcycle.