Drive wheels propel a vehicle forward by receiving power from the engine, while steer wheels control the vehicle's direction by turning.
Understanding the roles of different wheels on a vehicle is fundamental to how cars and trucks operate. The key distinction lies in their function: one set is responsible for moving the vehicle, while another is responsible for steering it.
Drive Wheels Explained
Drive wheels, also referred to as driven wheels, are those connected to the vehicle's engine or motor. They receive power, causing them to rotate and push the vehicle forward or backward.
- In a two-wheel drive vehicle, power is delivered to only two wheels. This can be either the front wheels (Front-Wheel Drive - FWD) or the rear wheels (Rear-Wheel Drive - RWD).
- In a four-wheel drive vehicle, power is distributed to all four wheels, providing enhanced traction.
The primary function of drive wheels is propulsion.
Steer Wheels Explained
Steer wheels are the wheels that pivot or turn to change the direction of the vehicle. As stated in the reference, a steering wheel is a wheel that turns to change the direction of a vehicle. This turning action is controlled by the driver using the steering wheel inside the cabin.
- On most cars, the front wheels serve as the steer wheels.
- Some larger vehicles or specialized equipment might have rear-wheel steering or even all-wheel steering for increased maneuverability.
The primary function of steer wheels is directional control.
Key Differences Summarized
Here's a simple comparison of the two types of wheels:
| Feature | Drive Wheels | Steer Wheels |
|---|---|---|
| Function | Propels the vehicle (receives power) | Changes the direction of the vehicle (turns) |
| Power | Connected to the engine/motor | Not necessarily connected to the engine/motor |
| Location | Can be front, rear, or all wheels | Typically front wheels on most vehicles |
It's important to note that on many vehicles, especially Front-Wheel Drive (FWD) cars, the front wheels serve a dual purpose: they are both the drive wheels and the steer wheels. However, their distinct functions remain – one for power, one for direction. A trailer wheel, for instance, is neither a drive wheel nor a steer wheel; it simply follows.
Understanding these fundamental roles helps explain how different vehicle types handle and perform.
