| Warming cold tyres to minimum installation temperature |
Note | This instruction also applies to ultra-high performance tyres (height/width ratio smaller than/same as 45% and speed symbol greater than/same as V). |
WARNING | The minimum installation temperature of a tyre must not be less than 15°C or higher than 30°C in the core of the tyre. |
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| To install tyres without damage, it is especially important to warm the upper part of the sidewall and the inside of the upper bead to at least 15 °C. |
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| This internal temperature is referred to as the core temperature. |
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| Rubber is a poor conductor of heat. Therefore, a cold tyre must be left in an area with the correct temperature for a sufficiently long period so the inner rubber layers can warm up to at least 15°C. |
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| The surface temperature of the tyre during the warming up phase is no indication of its internal temperature. |
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| To enable cold tyres to absorb the heat from the ambient air as quickly as possible, they should not be stacked, but should be stored individually. In this way, the warm air “circulates” effectively around the tyres. |
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| Tyres must never be placed in front of a radiator or hot air blower for warming, since this can very quickly lead to critical surface temperatures. |
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| Heating the tyres without damage can only be achieved by heating with warm water or warm air (max. 50°C)! |
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| When cold tyres (below 0 °C) are transferred to a warm environment (above 0 °C), a layer of condensation immediately forms on the surface of the tyre. This layer of condensation indicates that the tyre is intensively absorbing heat from its environment through the process of water vapour in the air condensing out on the tyre surface. |
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| Once the condensation has thawed and perspiration water forms, this should be dried off with a cloth. This prevents the continuing heating process from being delayed due to low evaporation temperatures. |
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| If the tyre temperature is at least 0°C, a tyre should be stored for at least 2 hours at a room temperature of at least 19°C. |
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| If the tyre temperature is lower than 0°C, a tyre should be stored for at least 2.5 hours at a room temperature of at least 19°C. |
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| If possible, tyres should be stored in the workshop 1 day before they are fitted (order preparation). |
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| Store on an insulated base, pallet or the like, as high up as possible. |
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| Position the tyres individually to allow the warm air to “circulate” around them effectively. |
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| Wipe off perspiration water. |
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| Never heat with a radiator or hot air blower! |
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