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No. 50100 TIRELIEF™ Kit
Method #1: Install TIRELIEFS in the rim by drilling and tapping a 1/8” NPT
pipe thread hole near the valve stem (they will not affect tire balance). They
should be mounted radially, that is at a 90º angle to the axle centerline. Keep
a small amount of pressure in the tire to blow out the chips when drilling and
tapping. Use silicone sealer on the threads and tighten the TIRELIEF in place.
(DON’T over tighten.) The “O” ring may be used for extra seal and the silver
locking nut may also be used.
Method #2: If the rim is too thin to thread, drill an 11/32” hole and use the
silver locking nut on the inside of the wheel to hold the TIRELIEF in place.
TIRELIEFS are adjusted by loosening the thin knurled jam nut and screwing
the cap down to raise the set pressure or backing off to lower pressure. Then
retighten the jam nut. (DON’T over tighten.)
To set TIRELIEFS put the pressure you want plus 2 psi in the tire. Slowly
back off the cap until you just start to hear air coming out of the TIRELIEF.
Tighten the jam nut and add more air to the tire until it is coming out of the
TIRELIEF faster. Let it bleed down for 5 minutes and check the pressure.
If it is not correct, loosen the jam nut, turn the cap slightly, down for
higher, back off for lower pressure. Tighten the jam nut, add more air pres-
sure and let it bleed down as before. After you have done this once or twice it
will go very quickly.
At the track the first time check the settings frequently and readjust as nec-
essary. After the first race they should not change.
If you want more than 30 psi use one of the small aluminum shims inside
the adjusting cap to raise the pressure range slightly. Use the extra springs to
change the adjustment range to 3 - 15 psi.
To lock the TIRELIEF shut (for example to stretch the tire for stagger)
screw a 10-32 machine screw into the hole in the cap until it just touches the
poppet inside. DON’T over tighten.
Don’t allow dirt or mud to pack up around the TIRELIEF. Some could get
inside and cause it to leak. If you wash your car, we recommend our protec-
tive vinyl TIRELIEF covers, No. 50170.
Instructions for installing
and using TlRELlEFS™
Adjusting Cap
(spring is inside -
shim goes inside cap if needed)
Adjusting jam nut
“0” Ring
Rim
Silver Locking Nut
(inside wheel)
Use the low pressure springs to convert
TIRELIEFS to 3 - 15 psi pressure range.
Simply loosen the thin jam nut, unscrew the cap and
replace the spring. Reassemble, and adjust.
Instructions for No. 50290 TIRELIEF Setting Tool
The tool works by connecting to your compressed air line. This method gives more accurate readings of the setting than
by using a hand pump type model.
1) Install one of your air system quick disconnect adaptors by the button valve. Connect to your air line.
2) To test, screw a TIRELIEF into the end of the tool. The “0” ring must be used. Hand tight is fine.
3) Push the button valve. The pressure will rise slowly until the TIRELIEF begins to bleed off. Release the button and the
pressure will drop to the setting of the TIRELIEF. Adjust and retest if needed.
NOTE: DO NOT allow the pressure to rise above the maximum on the gauge. DO NOT remove the air flow
Retaining nut
Self Sealing
Adaptor
Rim
Grommet
• Install Self Sealing Valve in a clean 5/8” hole in the rim. Retaining
nut
• Install grommet so that it is half inside wheel and half outside.
• Twist valve into grommet as shown and tighten nut inside rim.
• Install TIRELIEF with “0” ring - Don’t over tighten Valve.
(3 pages)
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