What is the fine-grained topic of the following text: The French pair of Raphael Astier and Frédéric Vauclaire, driving for Team Milano Racing in the Abarth 124 rally, have won the FIA R-GT world championship with a race to spare after their victory in the Czech Republic in the Barum Czech Rally Zlìn – the fourth event in the series, also valid for the European Championship. Only return the topic.
Raphael Astier and Frédéric Vauclaire winning the FIA R-GT world championship