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14 - Bead. This is the part that joins the tyre to the
rim. The bead point (a) is the inner corner. The spur
(b) is the inner part of the bead. The base (c) is the
area resting against the rim. The groove (d) is the
concave part against which the rim shoulder rests.
Tube type tyres. As a tyre has to contain pressurised
air for a long period of time, an air chamber is used.
The valve for inserting, maintaining, controlling
and restoring pressurised air is, in this case, part
of the chamber.
Tubeless tyres. Tubeless tyres consist of a tyre
with inner sidewall lined with a thin layer of spe-
cial impermeable rubber, called a liner. This liner
helps to maintain air pressure in the casing. This
type of tyres must be mounted on specific rims,
on which the valve is fixed directly.
II - Rim (Wheel). The rim is the rigid metal part
which connects the vehicle hub to the tyre, on a
fixed but non-permanent basis.
a
c
Rim profile. The rim profile is the shape of the
b
section in contact with the tyre. It is made with
d
different geometric shapes that serve to ensure:
e
easy assembly of the tyre (inserting the bead
into the channel); safety on the move, in terms of
anchoring the bead in its seat.
When observing a section of the rim, it is possible
i
g h
to identify different parts that compose it: a) rim
width – b) shoulder height – c) tubeless anchoring
(HUMP) – d) valve hole – e) ventilation opening – f)
f
offset – g) central hole diameter – h) connection
hole centre to centre distance i) keying diameter
– j) rim channel.
III - Air chamber (tube type tyres). The air chamber
j
is a closed ring-like rubber structure with a valve,
which contains pressurised air.
Valve. The valve is a mechanical device to inflate/
deflate the tyre and maintain air pressure inside
c
the air chamber (or tyre in the case of tubeless
a
b
tyres). It consists of three elements: the valve
UK
closing cap (a) (to protect the internal mechanism
from dust and guarantee air tightness), an internal
mechanism (b) and the base (c) (the outer lining).
ProLine 124-221-321-324 Operator manual
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