8
47
Wheel
measurement
8-2
How to measure minimum dual spacing
Minimum dual spacing measurement is determined by the tire manufacturer and may be obtained
from the tire manufacturer's handbook. To determine if the Alcoa aluminum dual wheel assembly
has adequate minimum dual spacing for the selected tires, double the wheel outset measurement of the
Alcoa wheel used. If the doubled outset measurement is equal to or greater than the tire manufacturer's
recommendation, there will be sufficient minimum dual spacing. Wheel inset and outset is given for
each Alcoa wheel on pages 2 and 3. Both inset and outset wheels are measured from the mounting
surface of the wheel to the center line of the rim. Maintaining proper tire inflation and load ratings are
essential to maintaining proper minimum dual spacing.
Dual Spacing
Tire Clearance
Vehicle
clearance
Tire section width
Wheel
Inset
Backspace
Tire center line
Tire center line
Wheel outset
(same as offset
or half dual spacing)
Center
hole dia.
Bolt
circle dia.
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