WHEELS
AND
TYRES
(ih)
Rims
All
rust should
be
cleaned off the
exterior of the
rim
and the affected
portion rotected with enamel or
simk &h. When the tyres are
changed the interior of the rims
can
be inspected for corrosion.
Particular attention must
be.
paid
to the corrosion,
if
it is not cleaned
away the tyre
will
become affected.
(d)
Wheel
Building
(See
Fig.
19)
The spokes should be laced as shown
in
the illustration and particular atten-
tion must be paid to the positioning of
the valve hole, failure to observe this
point
will
mean
that
the valve stem of
the inner tube will foul one or more
spokes, resulting in insufficient clear-
ance to connect
an
air
line.
The hub shell, spokes and
rim
should
be
loosely assembled and the
rim
brought into true position relative to
the hub, ensuring that the outside dish
is maintained.
When this condition is reached the
wheel should be mounted on a
running
hub, each pair of spokes should
be
carefully
tensioned a small amount at
a
he,
working from one
pair
,and
thence to the diametrically opposite
pair. Afterwards,
repea,hg the pro-
cedure
with
the opposed pairs which
are located at nght angles to the orig-
inal
pairs.
At
each
stage of the tensioning the
truth of the wheel should
be
checked
both for lateral (buckle) and up and
down movement
(gallop). Then check-
ing any buckle or gallop by giving a
slight additional or reduction of tension
to the appropriate spoke or sets of
spokes.
It is important that as little additional
tension as possible is given when
nu-
ing the wheel. The desired condition
when the wheel is
finally
true is that
each spoke should have
as
near
as
pos-
sible the same tension as
its
neighbour.
This condition can be attained by
slackening the tension of one spoke, as
as
well
as
increasing
that in the opposite
spoke, to position the
rim
correctly.
An
experienced wheel builder
will
be
able to gauge when the
correct
tension
has
been
reached, either by the general
feel of the spokes or by the
ringing
note
which the spokes
will
give when lightly
struck with a small spanner or similar
metal object.
When building is complete
the spoke
ends should be examined to ensure that
none protrude through the
nip
le.
J
Any
protrusions should
be
l3
off and
the
Wgs
brushed away from the *.
NOMINAL
INSET
k'
OUTSIDE DISH
3%':&'
W.
19
Wheel
Building
Dimensions.
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