WHEELS
AND
TYRES
Fio.l
'''''
WHEELS
AND
TYRES
General
lyres
of the
correct
type
and
dimenSions, at
the
correct
cold
Inltallcn
pressures. are an
Integral
pari
of
the veh,c1e"s deSign
and
regular
mamtenance
of lyres
contnbutes
nOI
only
to
safety,
but
to
the
deSigned
funcuonmg
of
the vehicle Road-
holding,
steermg
and
braking are especIally vulnerable
to
Incorrectly pressurIZed.
badly
fItted
or
WOfn
lYres
lyres
01
the
same size
and
type
but
of
different
make have
Widely v3ryJng characteristIcs It
IS
therefore
recommended
that lyres
of
the same
make
are
lilted
to all wheels
Tyrs
Size.
Type.
Pressures
The pressures
recommended
(see "General SpeCification")
provide
optimum
nde
and
handling
characteristics for all
normal
operatmg
conditions
The pressures
should
be
checked. and adjusted If necessary,
once
per
week ThiS
50
should be
done
With the tyres cold Tyre temperatures and
pressures
mcrease
when
running
Bleeding a
warm
lyre
10
the
recommended
pressure
will
resull
m under,mflatlOn
which
may be dangerous A slight natural pressure loss
occurs
With
time
If thiS exceeds 0
14
kg/cm
2
(2 Ib/ln
2
)
per
week.
the
cause should be mveslgated
and
rectified
It
IS
dangerous and
In
some countries Illegal
to
drive a
vehicle With tyres
mflated to
mcorrect
pressures Drivers are
adVIsed to familiarise themselves With
localleglslauon
WsarlFlg
1)
All tyres htted as origInal
equIpment
Include tread wear
mdlcators
In
their
lread
pattern
When
the
tread has
worn
to
a
remammg
deplh
of 1 5
mm
(006
m)
the
mdlcators appear
at
lhe
surface as bars
whIch
connect
the tread pattern across
the
fuU
WIdth of the tyre It
IS
Illegal m certam SlateS to
contmue
to
use lyres after the tread has
worn
to less than
thIs
depth
II
should
be
noted
that
the propert,es
of
many
lyres alter
progressively WIth
wear
In
particular
the
·wet
grip'
and
aQuaplamng reSistance are
gradually
but
substant,ally
reduced Extra care
and
speed restrIction should therefore
be
exerCised
on
wet
roads as
the
effectIVe tread
depth
diminishes
Incorrect wheel
alignment
will
accelerate tyre wear Fms
on
the
mSlde or outSide edges of
the
tread pattern are caused by
excessive lOe-m or toe-out respectively As fms may also be
caused
by
high
cornering
speeds or road
camber
It
IS
better
to
have the cause ascertaIned
by
haVIng
the
wheel
alignment
checked Refer to 'General SpeCification'
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