5
30
Dualed wheels, steel
inner / aluminum
outer stud located
ball seat mounting
(continued)
5-7
NOTICE: Do not exceed
maximum wheel load.
Cus tomer must compare
OEM vehicle load rating to
maximum wheel load rating.
Refer to tire manufacturer’s
recommendation for proper
tire pressure. Be fore mounting
the tire perform a wheel
fitment check to insure
proper clearance from any ob-
structions.
NOTICE: Check for and
replace bent, broken, cracked
or damaged studs. When
replacing broken studs, always
replace the studs on each
side of the broken stud. If two
or more studs are broken,
replace all the studs for that
wheel position. Check with
the stud manufacturer for
regular maintenance and stud
replacement practices.
All wheel fastener hardware
should be grade 8 or metric
conversion 10.9. Follow the
hardware manufacturer’s
recommendations when
replacing studs.
Disc Mate wheel spacers are recommended for use with Alcoa Dura-Bright
®
surface treated wheels
to protect the wheel contact surfaces from marring. Disc Mate wheel spacers are placed between the
contact surfaces of the Dura-Bright
®
wheel and the brake drum and between the steel and aluminum
wheels as shown below.
Correct dual mounting for steel inner/aluminum outer stud located ball seat mount.
Inner Steel Wheel
Drum
3/4" Stud
Hub
1.31" to 1.44"
stud standout
Outer Cap Nut
P/N 5996R or L
(See 5-2, page 26)
Inner Cap Nut
P/N 7896R or L
(See 5-2, page 26)
Alcoa Aluminum Wheel
Disc Mate (when used)
WARNING Incorrect inner cap nuts used with steel wheels can bottom out on the
unthreaded portion of the stud before the wheels are properly seated.
Improperly seated wheels can run loose, cause stud breakage and disengage from the
vehicle which can lead to serious injury or death. Loose running wheels can lead to stud
breakage.
Use only cap nut 7896R or L or its equivalent when mounting steel
inner duals.
WARNING Inadequate wheel support surface can lead to stud hole-to-stud hole fracture
resulting in separation of the outer disc and rim from the vehicle.
Separation of the wheel from the vehicle can cause serious injury or death.
Alcoa aluminum wheels with 11-1/4" diameter bolt circle require a support surface at
least 13-3/16" in diameter. Check the outer support surface of the inner steel wheel for
flatness and adequate diameter before installing the outer wheel. When the wheels are
serviced, check the mounting surfaces of both wheels for stud hole to stud hole cracks.
If cracks are found, immediately and permanently remove the wheel from service.
For the support surface diameter required by other bolt circle sizes, ask your Alcoa
representative.
WARNING Use of two-piece flange nuts on ball seat wheels or ball seat
cap nuts on hub piloted wheels is dangerous.
Using the wrong cap nuts can cause loss of torque, broken studs and cracked wheels,
conditions which can lead to serious injury or death.
Use only hardware designed specifically for each wheel type. See Section 5-2 pg. 26 for
proper hardware assemblies.
WARNING
WARNING
WARNING
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