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AE1031H
13.GLOSSARY
Tyre
A tyre consists of: I-tyre, II.rim (wheel), Ill-inner tube (with tube type tyres), IV-
pressurised air.
The tyre must:
-withstand a load,
-ensure driving power,
-steer the vehicle,
-aid handling and braking,
I.Tyre The actual tyre is the main part of the over.all tyre in contact with the road and
is therefore designed to withstand internal air pressure and all other stress arising
from use.
1.The tread. This is the part in contact with the ground when the tyre rolls. It
comprises a rubber compound and a "pattern" that is suitable for ensuring good
resistance to abrasion and good grip in dry and wet conditions, as
2.Edge or bracing. This is a metal fabric or textile insert, in the area of the outer bead
part It protects the casing plies from rubbing against the rim.
3.Casing. This is the resistant structure and com¬prises one or more layers of rubber
plies. The way the plies comprising the casing are arranged give the structure its
name. The following structures are possible:
Conventional: the plies are inclined and arranged so that the strands comprising
a ply overlap with those of the adjacent ply. The tread, which is the part of the tyre
in contact with the ground, is part of the sidewalls and so during rolling, sidewall
flexure is transmitted to the tread.
Radial The casing consists of one or more plies with the
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