Corghi Artiglio Master 26” MI Manual De Uso página 68

a
c
b
d
e
g h
f
j
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13 - Shoulder. The outermost part of the tread, between
the edge and the start of the sidewall.
14 - Bead. The part where the tyre fits onto the rim.
The tip of the bead (a) is its inner edge, while the
spur (b) is the outermost part of the bead. The base
(c) is the zone in contact with the rim. The cavity (d)
is the concave part on which the shoulder of the rim
rests.
Tube type tyres Since the tyre must be able to contain
the pressurised air for a relatively long time, an inner
tube is used inside the tyre. In this case, the valve
used to insert, retain, check and top up the pressurised
air forms part of the inner tube itself.
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 fixed directly.
II -Rim (Wheel). The wheel is the rigid metal element
which provides the fixed but not permanent connec-
tion between the hub of the vehicle and the tyre.
Rim profile. The profile 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.
i
A cross-section view of the rim shows a number of its
constituent parts: a) rim width - b) shoulder height
- c) humps for anchoring tubeless tyres - d) valve
hole - e) ventilation openings - f) off set - g) centre
hole diameter - f) distance between fixing holes - i)
keying diameter - j) drop centre.
Artiglio Master operator's manual