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IV - THE MAIN PROBLEMS
rubber breakdown in the cold -
Track specificities
The fundamentals
All rubber compounds used in tyres have performance windows that fall within a range of temperatures.
•There is a low temperature threshold from which the rubber loses elasticity and becomes brittle.
This can be as low as -55°C for some rubber compounds. This is called the breaking point.
•There is also a high temperature threshold from which the rubber becomes pasty/viscous.
This is generally above 200°C. It is called the reversion point.
The vast majority of our tyres operate within these thermal limits without impediment.
Supersport and competition tyres
In competition and hypersport tyres, the very high temperatures encountered (related to the very high
levels of grip) require a specif ic blend of tyre compounds to withstand them.
One consequence of this is that these soft compound tyres have a break point of as high as 15°C.
Handling these tyres at this temperature or lower may result in the tread or other area of rubber on the
tyre literally breaking. Care must therefore be taken to store the tyres in appropriate conditions which
avoid these temperatures. If this occurs, the tyres should not be handled at all.
Warning: Rubber
breakdown in the cold
can appear inside the
tyre only and so remain
invisible. It can manifest
itself as one small crack
or many larger cracks all
around the tyre.
MICHELIN
Power Performance
MICHELIN
Power
Slick ²
MICHELIN
Power
CUP ²
MICHELIN
Power
CUP
EVO
MICHELIN
Power
Supermoto
MICHELIN
Power
GP
2
MICHELIN
Power
GP
MICHELIN
Power 6
MICHELIN
Power
5
MICHELIN
Power
Supermo-
to
rain
MICHELIN
Power
RAIN
Handling transport storage
Never handle the tyre at a
temperature below 10C in
order to prevent damage to
the tyre
Never handle the tyre at a temperature below 5C
in order to prevent damage to the tyre
Never handle the tyre at a temperature below 10C
in order to prevent damage to the tyre
Mounting and dismounting
Before f itting and unf itting
the tyre should have been
stored for at least 24h at a
temperature greater than
15C
Before f itting and unf itting the tyre should have
been stored for at least 24h at a temperature
greater than 10C
MICHELIN MOTORCYCLE AND SCOOTER 179
Technical data
