Which change can directly affect a vehicle’s weight distribution?

Changing the springs on a vehicle can have a direct impact on its weight distribution for several reasons. Springs support the weight of the vehicle and help to maintain proper ride height and suspension geometry. When springs are replaced, especially if they have different specifications (such as spring rate or length), they can change how weight is distributed between the front and rear axles. For example, if the new springs are stiffer or softer, they can affect how much weight is carried on each axle, which can lead to a change in the overall handling and balance of the vehicle.

In contrast, the other options tend to influence factors like ride quality, traction, or handling but do not directly alter the actual weight distribution. Replacing the tires mainly affects grip and rolling resistance but does not influence how weight is distributed across the vehicle. Adjusting tire pressure can affect handling and ride comfort, but it also does not change the weight distribution in a significant way. Aligning the wheels focuses on the angles of the wheels relative to each other and the road, which impacts tire wear and handling characteristics, but again does not affect the vehicle's overall weight distribution. Thus, replacing the springs is the most direct way to alter weight distribution.