Wheels With Run Flat Or Low Profile Tyres - Hunter TCX3000 Manual De Instrucciones

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MOUNTING
1- Make the appropriate checks on the tyre and rim as described on the relevant
section on page 44 of this manual.
2- If the rim has been removed from the chuck, clamp it again proceeding as
described earlier in the "WHEEL CLAMPING" section on page 45 of this manual.
NOTE: For safety, the valve should ALWAYS be replaced using the special tool.
3- Lubricate the entire inner surface of the rim thoroughly. Lubricate the beads
of the tyre thoroughly, on both the inside and the outside, around the whole
circumference, over a thickness of at least 30 mm.
4- Turn the multiple tool (revolver) to bring the mounting tool into the working
position.
N.B.: The tools must be in the "rest" position, leaving enough room for the tyre to
be positioned on the rim.
5- Turn the chuck until the valve is at the 7 o'clock position.
6- Place the tyre horizontal on the rim, slightly tilted at 12 o'clock.
7- Lower the upper tool until it is about 30 mm inside the rim, and a few mm from
its outside edge (see Fig. N/1).
8- Press down the tyre by hand at 3 o'clock to fit it onto the rim (see Fig. N/2).
9- Start clockwise rotation until the bottom bead is completely mounted.
NOTE: Proceed in such a way that the rim and tyre move as one.
10- Without changing the position of the mounting tool, move the valve to about
5 o'clock.
11- Press down the sidewall of the tyre by hand at 3 o'clock to force the bead down
to the height of the well (see Fig. N/3).
12- Start rotation, following the motion with one hand, until the top bead is
completely mounted.
NOTE: If it is difficult to perform these operations by hand, the mobile bead
presser can always be used, placed at 3 o'clock (see Fig. N/4).
Low profile tyres are tyres having a ratio of less than 1 between their height (H) and cross-section width (C)
(e.g. low profile series 45 indicates an H/C ratio = 0.45).
In order to be considered as "low profile", tyres must also have a maximum speed code of "V" or above.
Run-Flat tyres are tyres which still allow the vehicle to travel for a specified distance at a specified speed even if no longer pressurised (N.B.
the distance and speed values vary from manufacturer to manufacturer).
At present, there are two different types of run-flat tyres on the market:
- the type with reinforced sidewall, also known as self-supporting tyres, which are made from a different blend of rubber and have a
reinforced structure enabling the shoulder of the tyre to support the weight of the car even when the pressure inside it has fallen to zero.
- the type with internal supports, where the rim contains a ring which supports the tyre's sidewall if the internal pressure drops.
The internal support may be made from plastic (Pax-System) or metal (Support-Ring).

11.2 WHEELS WITH RUN FLAT OR LOW PROFILE TYRES

49
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N/3
N/4
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