17. GLOSSARY
heel and tyre assem ly
et consistin o
yre
heel union o rim and disc
nner tu e i any
Air under pressure
I - T yre he tyre is the main part o the comple that
is in contact ith the road and is there ore desi ned
to support the internal air pressure and all other
stresses arisin
rom use
he tyre section sho s the arious parts it consists o
he tyre must
- ithstand a load
- ensure dri in po er
- steer the ehicle
- aid handlin and ra in
- aid vehicle suspension.
1 - T he tread t is the part in contact ith the road
hile the tyre is rollin
pound and a pattern suita le or ensurin
resistance to a rasion and ood rip in dry and et
conditions as ell as quiet operatin conditions
2 - Edge or b racing. It is an insert of metallic or
te tile a ric placed at the outer part o the ead
it is used to protect the carcass plies rom slidin
a ainst the rim
3 - Casing. This is the resistant structure and com-
prises one or more layers o ru
the plies comprisin the casin are arran ed i e
the structure its name
possi le
Conv entional: the plies are inclined and arran ed
so that the strands comprisin a ply o erlap
those o the ad acent ply
part o the tyre in contact ith the round is part o
the side alls and so durin rollin
is transmitted to the tread.
R adial: the casin consists o one or more plies ith
the cords in radial direction.
radial casin in itsel is quite unsta le o ma e it
sta le and pre ent incorrect tread mo ement in the
area o contact ith the round the casin and the
U ser' s manual
t comprises a ru
er com-
er plies
he ay
he ollo in structures are
he tread
hich is the
side all e ure
I
II
1
ood
ith
9
3
III
I V
1 3
12
8
5
115
EN