A drive wheel
is a roadwheel
in an automotive vehicle
that receives torque
from the powertrain
, and provides the final driving force for a vehicle. A two-wheel drive
vehicle has two driven wheels, and a four-wheel drive
has four, and so-on.
A steer wheel
is one that turns to change the direction of a vehicle. A trailer wheel
is one that is neither a drive wheel nor a steer wheel.
Drive wheel configurations
For four-wheeled vehicles, this term is used to describe vehicles that are able to transmit torque to at most two roadwheels, referred to as either front-
or rear-wheel drive
. The term 4x2
is also used, to denote four total roadwheels with two being driven.
For vehicles that have part-time four-wheel drive
, the term refers to the mode when 4WD is deactivated and torque is applied to only two wheels.
Four-wheel drive or All-wheel drive
("four-by-four"), all-wheel drive
, and AWD
are terms used to describe a four-wheeled vehicle
with a drivetrain that allows all four roadwheels
to receive torque from the internal combustion engine
simultaneously. While some people associate the term with off-road vehicles
- powering all four wheels provides better control, and therefore safety on slick ice
, and is an important part of rally racing
on mostly-paved roads.
(or FWD for short) is the most common form of internal combustion engine
layout used in modern passenger car
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