MotoGP riders are to get some help with braking. From Mugello onward, all riders will be able to choose once again between running 320mm and 340mm brake discs on the front wheel. Use of the 340mm discs had been made compulsory at Motegi for safety reasons, but now, they will be available at all circuits.
The 320mm brake discs had been made compulsory at the end of the 2011 season, in an effort to cut costs. At that point, teams were free to choose from multiple sizes and masses of brake disc, meaning they were forced to purchase and transport sizeable numbers of discs to each race, while only using one or two sizes. Limiting choice was meant to rationalize the process, and cut costs for the teams.
Unfortunately, the compulsory brake disc size was imposed at the same time as bike capacity and weight were increased. In 2012, the first year of the restrictions, capacity of MotoGP machines was increased to 1000cc, and weights were increased to 157kg, and a year later to 160kg. With more power and nearly 7% more weight, braking forces were growing very large once again.