loosen the other bead. Once the beads are broken, the
tire can be removed from the rim by standing the tire on
the thread and prying the wheel out of the tire. Ensure
the valve stem is not bent or damaged as the wheel is
To replace the tire, position the wheel, as shown in
figure 3-32, view C. Lower the tire over the rim, and at
the same time, make sure the valve stem is passed
through the valve hole and points upward.
NOTE: The valve stem should always point toward
the removable side ring. If there is no side ring, point it
toward the disc portion of the wheel.
The next step is to center the side ring and force one
end into position with your foot. Then the ring can be
installed as shown, or the repair person can merely walk
around the top of the ring and force it to slide into the
locking groove. Inflating a tire mounted on a locking
ring rim is dangerous. An improperly seated lock ring
may blow off, causing serious injury to you or any other
person in its path. A sprung ring, or one which is bent or
twisted, may be difficult to install and, if used, is a safety
hazard and should be replaced. Before applying air
pressure to this tire, be sure that the locking ring is seated
against the rim of the wheel through its entire
circumference. If the lock ring does not seat properly,
inflate it to 5 to 10 pounds, then tap the locking ring
carefully with a mallet. NEVER STAND IN FRONT OF
OR OVER THE LOCKING RING. ADDITIONALLY,
REMEMBER TO USE THE SAFETY CAGE FOR
INFLATION. When you have to inflate a tire that is
already mounted, use a snap-on chuck which is an air
hose that snaps onto the valve stem. This allows you to
stand to one side of the tire. Make it a professional
practice to never stand in front of a tire being
Tubeless Tire Repair
Some tires are tubeless. Instead of being sealed in
an inner tube, the air in these tires is sealed in a space
between the outer casing and the rim. Both this space
and the point of contact of the tire against the rim must
be airtight. The rim, on which the valve for inflating the
tire is mounted, becomes a part of the air-retaining
chamber. Do not tear or otherwise injure the sealing ribs.
Before replacing a tubeless tire, examine the rim
carefully for dents, roughness, and rust; any defects may
impair or break the air seal. Straighten out any dent with
a hammer, and use steel wool or a wire brush to clean
the bead seat area of any rust or grit. After cleaning, paint
any bare metal spots where the tire bead seats to make
it easier to remove the tire later. If the rim is badly
damaged, replace it with a new one.
The procedure for repairing a tubeless tire is
accomplished by the following steps:
1. Inspect the inside of the tire and remove nails or
other damaging items. Then scrape the damaged area
with a sharp-edged tool and buff (fig. 3-33, step 1). Be
careful not to damage the liner or expose any cords.
NOTE: Serious injury can result using your bare
hand to free for obstructions, use a rag to feel inside the
2. Lubricate the hole by pushing bonding
compound into the hole from both sides of the tire (fig.
3-33, step 2). Also, pour bonding compound on the
insertion tool and push it through the hole with a twisting
motion until it can be inserted and withdrawn easily.
3. Using a plug slightly larger than the hole, place
it in the eye of the hole of the insertion tool. Wet the plug
with bonding compound. Always pour it directly from
the can so the contents in the can does not become
contaminated, as shown in figure 3-33, step 3.
4. While stretching and holding the plug with your
hand, insert the plug into the hole from the inside of the
tire. Stretch and hold the plug until it is forced into the
hole and one end extends through it, as shown in figure
3-33, step 4.
5. After the plug extends through the tire, remove
the insertion tool and cut off the plug approximately
1/16 inch above the surface (fig. 3-33, step 5).
6. When using a cold patch, carefully remove the
backing from the patch and center the base of the patch
on the damaged area. Stitch the patch down firmly with
the stitching tool working from the center out (fig. 3-33,
7. When using a vulcanizing hot patch, cover the
area with a light coat of glue and allow it to dry. This
glue normally comes with the hot patch kit. Remove the
backing from the patch and center it on the damaged
area. Clamp it finger tight, apply heat, allow to cure, and
then cool. (fig. 3-33, step 7).
NOTE: Each patch or plug kit should contain