1-3
TU
BE
S,
T
IR
ES,
R
IM
S
phone: 1-800-854-3140 | 1-503-304-8899 fax: 1-800-366-7505 | 1-503-304-1899
www.jjamusements.com
TUBES
The J&J Bigfoot tire was designed to give maximum tread life and sidewall integrity. The tube is a key piece of the design
and has a special size and valve stem con
fi
guration. Always use J&J tubes (#00780-M) for best results and to avoid possible
premature failure of the tire and/or tube.
RIMS
Over the years, J&J has used two distinct styles of wheel rims. They have the same look and are the same size and basic
design. The di
ff
erence lies in the style of the lug nuts used. Please note, the lug nuts are not interchangeable from one
wheel design to the other.
Old style
New style
DISC-LOCK LOCKING NUT INSTALLATION & REMOVAL
J&J uses the Disc-Lock locking nut on our bead-lock wheel rims. The Disc-lock safety wheel nut is a free spinning, vibration-
proof wheel nut, speci
fi
cally designed to prevent wheel loss on commercial vehicles such as trucks, trailers and buses with
hub-piloted wheel systems.
They are used only on J&J serrated bead lock rims.
(#1-50-0189)
The system is essentially a double nut with ramps on two mating halves. When the inner hex of the
nut tries to loosen, it works against the incline of the outer hex. This is a simple and very positive way
to help insure that lug nuts will not work loose.
To install the Disc-Lock locking nut, follow the same procedure for conventional nuts
and torque to normal speci
fi
cations. To remove the Disc-Lock locking nut, place the wrench
or socket over both hexes and loosen. It is critical that the socket is seated over both halves of the nut
as shown in the illustration below.
(Use a 15mm deep/thin wall, 6-point socket.)
15mm
NOTE:
If the two parts “pop” apart they can usually be reassembled with a light tap. If the two halves will not stay
together, the nut must be replaced.
Outer hex
Inner
he
x
NOTE:
Old style: Raised lug stud holes to match
the tapered lug nuts.
New style: Rim is
fl
at around the lug stud
holes and uses a
fl
ange type “Disc-Lock”
lug nut. Rims also have a serrated bead
area to help prevent tire/bead slippage.
J&J SPECIAL TOOL
#1-60-A0311
This 15mm socket is machined
to
fi
t within the tight con
fi
nes of
the wheel assembly.