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13-13
Consumer information and Reporting safety defects
– CONTINUED –
Determining compatibility of tire and
vehicle load capacities
The sum of four tires’ maximum load ratings
must exceed the maximum loaded vehicle
weight (“GVWR”). In addition, sum of the maxi-
mum load ratings of two front tires and of two
rear tires must exceed each axle’s maximum
loaded capacity (“GAWR”). Original equipment
tires are designed to fulfill those conditions.
The maximum loaded vehicle weight is referred
to Gross Vehicle Weight Rating (GVWR). And
each axle’s maximum loaded capacity is referred
to Gross Axle Weight Rating (GAWR). The
GVWR and each axle’s GAWR are shown on the
vehicle certification label affixed to the driver’s
door.
The GVWR and front and rear GAWRs are de-
termined by not only the maximum load rating of
tires but also loaded capacities of the vehicle’s
suspension, axles and other body parts.
Therefore, this means that the vehicle cannot
necessarily be loaded up to the tire’s maximum
load rating on the tire sidewall.
Adverse safety consequences of over-
loading on handling and stopping and
on tires
Overloading could affect vehicle handling, stop-
ping distance, vehicle and tire as shown below.
This could lead to an accident and possibly result
in severe personal injury.
y Vehicle stability will deteriorate.
y Heavy and/or high-mounted loads could in-
crease the risk of rollover.
y Stopping distance will increase.
y Brakes could overheat and fail.
y Suspension, bearings, axles and other body
parts could break or experience accelerated
wear that will shorten vehicle life.
y Tires could fail.
y Tread separation could occur.
y Tire could separate from its rim.
Steps for Determining Correct Load
Limit
1. Locate the statement “The combined weight
of occupants and cargo should never exceed
XXX pounds” on your vehicle’s placard.
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