4-24
F-916-0217 Edition
MAINTENANCE AND LUBRICATION
Tire Matching
Both tires on the same spindle must be the same size in
order to properly distribute the load and braking forces
between them. The tire must be mounted on a rim and
properly inflated before measuring. If there is an
allowable difference in size the smaller tire should be
mounted to the inside position of the duals.
Tape Measuring Method
Measure around each tire on the tread surface. A
maximum difference of 3/4” is allowed between the two
mating tires of a dual
Figure 4-15: Measuring Tape Method
Straight Edge or String Method
(This method cannot be used if tire and wheel
assemblies are not mounted on the axle.) Jack trailer up
until the wheels are off of the ground. Hold a straight
edge against the tires of both ends of an axle. A gap at
one tire indicates a smaller tire. A maximum of 1/8” gap is
allowed
Figure 4-16: Straight Edge Method
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