71
After levering a part of the tyre bead over the edge of the rim you should
normally be able to slip off the whole tyre on one side by moving the tyre
lever around the whole circumference. Now you can remove the inner
tube. Make sure the valve does not get caught in the rim, as this can
damage the inner tube. If necessary you can remove the whole tyre by
pulling the other tyre bead off the rim. Repair the puncture according to
the instructions of the repair kit manufacturer or replace the inner tube.
When you have removed the tyre you should also check the rim tape
(a)
. It should lie squarely in the rim trough, covering all spoke nipples,
and should neither be damaged nor brittle.
In the case of double wall rims the tape must cover the entire rim base,
but it should not be so broad as to stand up along the inside edges of
the rim trough. Rim tapes for this type of rim should only be made of
fabric or durable plastic. If you are in doubt or if you have any questions,
then contact your WHEELER bicycle dealer.
G
If the fabric of the tyre is destroyed by the perforating ob-
ject, replace the tyre to be on the safe side.
G
Replace spoilt rim tapes immediately.
I
Keep in mind when buying replacement tubes that Schrader
valves do not fit in every rim!
I
If you get a puncture en route, inflate the inner tube and
bring it close to your ear. In most cases you can hear the air
coming out. At home you can help yourself with a bucket of
water where you can locate the hole by the bubbles. When
you have found the hole, look for the corresponding place
on the tyre and check it, as well. often you will find a for-
eign body sticking in the tyre, which ought to be removed.
otherwise another puncture can occur.
Tyre Mounting
When mounting a tyre make sure that no foreign matter such as dirt
or sand gets inside the tyre and that you do not damage the inner tube
in the process.
Slip one bead of the tyre onto the rim. Using your thumbs, press one
bead over the edge of the rim and then around the entire circumfer-
ence. This should normally be possible without using tools.
Stick the valve of the inner tube through the hole in the rim
(b)
. Inflate
the inner tube slightly so that it becomes round and push it into the tyre
all the way round. Make sure not to leave any folds in the inner tube.
To finish mounting the tyre, start at the opposite side of the valve. Using
your thumbs, press as much of the second bead of the tyre over the
edge of the rim as you can.
Make sure the inner tube does not get pinched and squashed between
the tyre and the rim. You can prevent this by pushing the inner tube into
the hollow of the tyre with a finger as you work along it
(c)
.
Work the tyre into the rim by approaching the valve symmetrically from
both sides. Towards the end you will have to pull the tyre vigorously
downwards
(d)
to make the already mounted portion of the tyre slip
towards the deepest part of the rim well. This will ease the job notice-
ably on the last centimetres.
Before fitting the tyre completely on the rim check again whether the
inner tube lies properly inside the tyre and press the last stretch of tyre
over the edge of the rim using the balls of your thumbs.
If this does not work, you will have to use the tyre levers
(e)
. Make sure
that the bent ends point towards the inner tube and that the inner tube
does not get damaged.
Push the valve a little into the tyre so that the inner tube
(f)
does not
get caught between the rim and the tyre beads. Check whether the
valve stands upright. If not, dismount one bead again and reposition
the inner tube.
To make sure the inner tube does not get pinched between the rim and
the tyre beads, move it sideways back and forth between the sides of
the rim. While doing so, also check whether the rim tape has shifted.
Inflate the inner tube to the desired pressure. The maximum pressure is
indicated on the side of the tyre.
Check whether the tyre is properly seated by inspecting the fine witness
line
(g)
on the tyre just above the rim edge. This line should be even to
the rim all around the tyre. Starting from the maximum tyre pressure
(h)
you can now reduce the pressure through the valve to suit your
needs. Please observe the recommended tyre pressure range.
a
b
c
d
70
e
f
g
h
Summary of Contents for Cross
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