How To Fix A Punctured Bicycle Tube


Today we’re showing you how to properly fix
a punctured bicycle tube. Before removing the punctured wheel, we first
need to disengage the brake. Begin by sliding the black brake boot away
from the brake noodle. Next, squeeze the brake arms together and
press the quick release noodle holder down away from the brake noodle. The brake is now disengaged. To remove the rear bicycle wheel, shift gears
to the outer most or smallest gear. This will allow the wheel to be easily removed. After shifting to the outer most gear, loosen
the axle nuts to remove the wheel from the bicycle frame. Once the axle nuts are loose, extend the spring
loaded derailleur. When the derailleur is extended, the rear
wheel can be removed freely. Some bicycles will have a quick release system
to remove wheels fast and easily. To remove a wheel with a quick release, simply unlock
the lever and loosen counter clockwise while holding the nut on the other side of the quick
release system. Once loose, the wheel can be removed freely. Next, we need to remove one side of the tire
from the bicycle rim using two tire levers. If your tire still has some air pressure left
in it, release the air by pressing in on the tire valve. Depending on the type of valve your tire has,
you may need to unscrew the pressure release or use something small to press the air release
valve Slide one of the tire levers in-between the
rim and tire and fold the lever down away from the rim. Most tire levers have a built in hook that
wrap around a spoke to keep the lever in place. Once the first lever is locked in place, take
the other tire lever, slide it into the gap in between the tire and rim, and slide around
the rim to remove one side of the tire. Next, remove the tire levers and push the
tube valve stem straight out into the tire. If the valve stem is not straight when removed
it could possibly tare the valve stem. You can now completely remove the inner tube. Inspect the inner tube for holes by inflating
it with a bicycle tire pump until you can hear air escaping. Many holes are not visible
until the tube is highly pressurized. Once the puncture is found mark it with a
permanent marker. Next, locate the valve stem opening on the
bicycle rim and align the valve stem on the inner tube with the valve stem opening. Now, locate the marking we made on the punctured
inner tube and then check the same location on the bicycle tire for any sharp objects
that may still be stuck in the tire. In order to fix the punctured inner tube,
we will need a patch kit. We will be using the patch kit included with our bicycle repair
kit, part number BT-21042. To begin we first need to lightly rough up
the area around the puncture with sandpaper or a rasp. Next, we want to cover the punctured area
with a rubber cement solution. Let dry for a minute. You will not get a good bond if
you put the patch on wet. Once the glue is tacky, apply the patch to
the tube and apply pressure for at least 60 seconds. Now remove the clear plastic. If part of the
patch come off after removing the clear plastic, apply more glue to those areas and let dry. Its not required, but you can also add a thin
layer of rubber cement over the edges for added strength. Before reinstalling the patched tube, add
a small amount of air to make installation easier. Locate the valve stem hole on the bicycle
rim and slide the valve stem straight into the hole. Make sure the valve stem is straight when
installed or it could cause a tear in the stem.
Fold the tire over the tube and begin to push the inner tube inside the tire. Now, using your hands, push as much of the
tire bead onto the rim as possible. Slowly work the bead around the rim until
the whole bead sits within the bicycle rim. If the tire is to tight and can not be installed
by hand, insert the tire lever between the rim and the portion of the tire that is not
yet installed. Slowly lever the tool upward and force the
tire over the rim edge. Use a second tool to push the tube into place if necessary. Once the tire and tube are installed, inflate
the tire to the recommended pressure written on the side of the tire. Next, follow the wheel removal instructions
from the beginning of this video in reverse to reinstall the wheel. Extend the derailleur and align the chain
with the smallest or outer most gear on the rear wheel. Pull the wheel up into the frame dropouts
and begin to tighten the axle nuts. Make sure the wheel is straight before fully tightening. Once the axle nuts are fully tightened, squeeze
the brake arms together and reconnect the quick release brake noodle holder and the
brake noodle. Last but not least slide the brake boot back
into place. Thank you for watching this demonstration
video on how to properly fix a punctured bicycle tire.