Heavy Haul Trailers
56
4.9.9
Matching Dual Tires
Matching of the duals by size will result in longer tire life. Improper matching will cause the larger
diameter tire to carry an overload. This will cause typical overloaded tire difficulties. The smaller
diameter tire will also wear more rapidly due to scuffing. Differences of not more than 1/4 inch (6.35
mm) in diameter or 3/4 inch (19.1 mm) in circumference are allowed.
Note:
The smaller of the two tires should be mounted in the inside position.
4.9.9.1
Tire Measurement
Measure the circumference of the tire with a tape
measure, after the tire is mounted on a rim and
inflated, but NOT mounted on the trailer. See Fig. 4-
11.
A straight-edge, square or string gauge can be used
to check the tires mounted on the trailer. See Fig.
4-12.
Note:
The dimension between the straight-edge and
the tires should not exceed 1/2 of the allowable
difference in diameter (1/4”/2 = 1/8” or 3mm).
FIG. 4-12.
Comparing Tire Diameter
FIG. 4-11.
Measuring Tire Circumference
Summary of Contents for H550 Series
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