Page 11 - michelin_GB

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Use and Maintenance Guide - MICHELIN
Comparing
tire construction
The solid tire
The conventional or “bias-ply” tire
Composition
Several types of rubber with different properties are layered one on top of
the other to provide adhesion and traction. So these are not really “pneumatic”
tires as they do not contain any air!
Specific use
Mainly used for forklift trucks.
Limitations when used intensively
Significant build-up of heat in the rubber, risks of damage when driven over
obstacles. The solid tire may then “break”.
Composition
This is made of nylon or rayon fabric plies criss-crossed over one another and
bonded together with rubber to form a diagonal structure.
The higher the required load capacity, the greater the number of plies.
Limitations when used
• Friction between the plies leads to a build-up of heat which can adversely affect the
tire’s performance. The strong link between the sidewalls and the crown causes the
contact patch to be deformed, resulting in poorer adhesion and accelerated wear.
•The tread of a conventional tire is sensitive to punctures.
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General information on earthmover tires
Solid tire
Conventional tire
The radial tire: numerous advantages
Composition
This combines metal (or fabric plies) extending from one bead to the other,
with a belt made of several steel plies designed to reinforce the crown of the tire.
A unique construction with numerous advantages
•The sidewalls and crown work independently:
- minimizes the deformation of the contact patch and the weight of the tire;
- improves adhesion and traction while slowing down the rate of wear;
- the metal casing increases the load capacity as it can take higher inflation
pressures.
•The flexibility of the sidewalls of a radial tire therefore provides greater comfort.
•The radial band provides better resistance to damage and punctures.
Tire performance levels that transform machine performance
Michelin invented the radial design and is an expert in this field. Radial tires
significantly improve the productivity of earthmovermachines. Productivity requires
a constant trade-off between the following factors: load, speed, operational
efficiency of the machines, tire service life, operator safety, etc…
Companies which try Michelin radial tires very rarely go back to conventional tires,
because it is so difficult to give up these advantages.
Using a radial tire also improves fuel economy and reduces
the environmental footprint
Radial construction separates the work
of the crown from that of the sidewalls