10
2
Mounting area
(continued)
Support surface diameters
Support surface (backup diameter) should be flat to the diameter recommended
on the chart below:
Number of Bolts Bolt Circle Mounting Type Backup Diameter Thread Size
10 11.25 inch U.S. Stud pilot 13.2-13.5 in. .750/1.125 in.
10 285.75mm Hub pilot 13.2-13.4 in. 22mm
10 335mm Hub pilot 15.0-15.2 in. 22mm
8 275mm U.S. Stud pilot 13.2-13.5 in. 22mm
8 275mm ISO Hub pilot 12.4-12.6 in. 20mm
Corrosion
2-6
Due to aluminum's natural resistance to corrosion, Alcoa aluminum disc wheels
do not need to be painted for most operating conditions. However, certain
environments can lead to corrosion. Some of these are: salt, chloride compounds
used for snow removal and highly alkaline materials. If the air used to fill
tubeless tires, or the tire itself, is not dry, the areas of the wheel under the tire
can corrode severely.
Bead seat and valve stem corrosion often are caused by entrapped moisture
which contains corrosive elements. Mild corrosion should be removed thoroughly
by wire brush and the rim protected with a coating of non-water-based lubricant
(see 3-1, page 18). Remove any severely corroded wheel from service.
CAUTION The use of liquid tire balancers or sealants in Alcoa wheels
may cause extremely rapid corrosion of the wheel rim surface.
Severely corroded wheels are unsuitable for service. Alcoa wheels corroded
by the use of liquid tire balancers or sealants will not be replaced under
the Alcoa limited warranty.
CAUTION
!
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