Cormach PUMA Manuel D'utilisation Et D'entretien page 40

UK
Tubeless tyres. The tubeless tyre consists of a tyre the inside
of which is coated with a thin layer of airtight rubber known as
a liner. This helps to ensure that the pressurised air inside the
carcass is retained. This type of tyre has to be mounted on a
special rim, to which the valve is ixed directly.
II - Rim (Wheel). The wheel is the rigid metal element which
provides the ixed but not permanent connection between the
hub of the vehicle and the tyre.
Rim proile. The proile of the rim is the shape of the section of
it which comes into contact with the tyre. It may have various
geometrical shapes intended to ensure: ease of mounting of
the tyre (insertion of the bead into the drop centre); and safety
in operation, terms of anchoring of the bead into its seat.
A cross-section view of the rim shows a number of its constituent
parts: a) rim width - b) shoulder height - c) humps for anchor-
ing tubeless tyres - d) valve hole - e) ventilation openings - f)
off set - g) open centre diameter - h) distance between ixing
holes - i) keying diameter - j) drop centre.
III - Inner tube (in tube type tyres). The inner tube is a rubber
casing in an endless loop, itted with a valve, which contains
the pressurised air.
Valve. The valve is a mechanical device which allows inlation/
delation and retention of the pressurised air inside an inner
tube (or a tyre in the case of tubeless tyres). It consists of three
parts: the valve cap (a) (to protect the internal mechanism from
dust and ensure an airtight seal), an internal mechanism (b)
and the base (c) (outer coating).
Tubeless Inlator. An inlation system which simpliies the
inlation of tubeless tyres.
Bead insertion. Operation which takes place during inlation
and ensures perfect centring between the bead and the edge
of the rim.
Bead pressing gripper. A tool intended for use during mounting
of the top bead. It is itted so that it grips the shoulder of the
rim and holds the tyre's top bead inside the drop centre. It is
generally used for mounting low proile tyres.
Discharge regulator. Union allowing regulation of the air low.
Bead breaking. Operation in which the bead of the tyre is
detached from the edge of the rim.
a
c
b
d
e
g h
i
f
j
c
a
b
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