Appendix B
Weight Distribution
INTRODUCTION
In the Medium Duty truck market, matching the wheelbase to the body specification is extremely important. Se-
lection of the wrong wheelbase may lead to premature component failure, poor performance, and ultimately a
dissatisfied customer. Before selecting the proper wheelbase, it is important to have a basic understanding of
weight distribution.
Abbreviations
Throughout this section, abbreviations are used to describe certain features and requirements of the vehicle
(see the list below). Review this list frequently so you know what the abbreviations mean.
Note:
The Model 220 CA figures are measured from the true back of cab to the centerline of the rear
axle.
To obtain a usable CA the body builder must subtract any required space behind the cab,
which
may be needed for other equipment.
CG =
Center of gravity: the balance point or center of a load. It is usually identified by a circle
with alternating black and white quarters.
CGf =
Distance from the centerline of the front axle to the center of gravity of the load (L). The
load can be any load such as a fuel tank, a body, or the payload.
FA = Front Axle
GVWR =
Gross Vehicle Weight Rating
L = Load: the weight that is carried. This could be the body, the payload or any item that has its
weight distributed between the two axles.
Lf = Portion of load (L) carried by front axle
Lr = Portion of load (L) carried by rear axle
RA = Rear Axle
WB =
Wheelbase Length
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