Why are tyres so important in rallying ?
They are the only link between the ground and the car; they must therefore be efficient, hard-wearing and strong at the same time. Also, in rallying, the big problem lies in selecting tyres several hours ahead of time for groups of special stages which are sometimes a long way from the service area.
Why is it necessary to think in terms of “groups of special stages”?
New tyres are fitted at the service area and must do 1, 2, or 3 special stages before being replaced at the next service area.
If the conditions differ from one special stage to the next (e.g. rain on SS1, dry roads on SS2), the right compromise must be found for the series of 3 special stages.
How to choose the right tyres ?
It depends on the distance to be traveled, the outside temperature and the surface. The hotter it is, the harder the compound required. Idem if the distance is long and the surface is aggressive. But it is difficult to strike the right balance because a hard compound is less efficient than a soft one…
Why are drivers so careful about tyre pressure ?
Rally drivers check the air pressure in their tyres about every 20 km (12 miles)! The correct pressure ensures that the tyres give maximum performance and also keep the team safe.
IN CROSS COUNTRY RALLYING
Are tyre regulations restrictive ?
In motor sport, all-terrain rallying is the discipline with the least restrictions. The regulations limit the maximum diameter (810 mm for four-wheel-drive; 890 mm for two-wheel-drive). All-terrain rallies therefore provide a very useful open testing ground.
Are BFGoodrich products well-known in the Cross Country Rally world?
As a result of their fantastic reputation in North America and their many Baja successes, BFGoodrich tyres quickly gained a reputation as a benchmark when they entered all-terrain rallies. Today, the leading players in the Dakar or the World Cup rely on BFGoodrich tyres.
BFGoodrich tyres have won the Dakar since 1999.
Do rally tyres use an anti-puncture system ?
The lengths of the stages and the high temperatures make it impossible to use an “active” anti-puncture system. However, the on-board pressure control system prevents some types of puncture and manages the consequences of such a disaster when a slow puncture occurs.
What temperatures can tyres withstand in all-terrain rallying ?
All-terrain rallies usually take place in regions where the mercury hits the roof. These are the highest temperatures in the field of mechanized sports: surface temperatures of up to 55°C! Therefore it is necessary to develop products designed for such extreme conditions.