The number of tyres available to teams competing in next season's World Rally Championship (WRC) and World Touring Car Championship (WTCC) will be reduced.
The World Motor Sport Council (WMSC) has announced that WRC cars will only be able to make up to seven tyre changes during a race, with a maximum of five tyres per change.
It means that WRC cars will only be able to use 35 tyres in any given rally in 2012, compared to 48 this year.
During a meeting in Singapore, the WMSC also confirmed that the number of tyres available to drivers will be reduced by a further 15 to 20 in 2013 and 2014.
A spokesperson for the WMSC confirmed that they made this decision as "tyre companies continue to increase the durability of their products while maintaining current levels of performance."
Meanwhile, drivers participating in their first race of the WTCC 2012 championship will be able to use 16 new tyres, rising to 20 tyres from thereafter.