MotoGP 2022. Motegi among the circuits that use the brakes to the maximum: the discs reach 355 mm in diameter

The Twin Ring Motegi is one of the highly demanding circuits for the brakes. On a scale of 1 to 6, it earned a difficulty index of 6. There are many close curves and violent braking: the cooling of the discs is critical.

September 22, 2022

C.n the beginning of autumn, MotoGP moves to the Far East where four races will be held this year, Australia included. According to Brembo technicians who work closely with all 24 of the premier class riders, the Twin Ring Motegi - where it last raced in 2019 - is one of the highly demanding circuits for the brakes. On a scale of 1 to 6 it earned a difficulty index of 6, the maximum.

THEThe Twin Ring Motegi is characterized by a few fast and very slow corners, interspersed with medium length straights: there are even 7 curves faced by the bikes at less than 100 km / h. Just theplenty of second gear corners makes it one of the most demanding for the brakes thanks to the difficulty in cooling the disks between one detach and the next.

P.roprio to deal with this kind of very difficult situations for the braking system, Brembo introduced Brembo i in MotoGP in 2022 355 mm carbon ventilated discs in diameter alongside the "conventional" 340 mm and 320 mm ones. Among other things, the first two were made mandatory by the MotoGP regulations in the Motegi, Spielberg and Buriram circuits, prohibiting the 320 mm discs for these 3 tracks which, on the other hand, remain usable in all the other GPs.

The restrictions are of course not valid in the presence of a race declared wet because the braking intensity is lower, just to give an idea, in series motorcycles the maximum diameter reached by the discs is 330 mm and is the prerogative of the Brembo system adopted on the Ducati Panigale.

P.To give a dimension of the effort to which the braking system of a MotoGP bike is subjected at Motegi, know that on the Japanese circuit it brakes on 10 of the 14 corners and for 5 of these the use exceeds 4 seconds: adding up all the time in which in one lap the riders are urging the brakes to get to 34 seconds, one third of the lap time. Very deep the braking of the first corner where he brakes for 5 secondsnecessary to lose 228 km / h.

Also noteworthy is the braking at turn 5, for which a load on the lever of 5.6 kg is required for a system pressure of 12 bar. Adding up all the forces exerted by a rider on the Brembo brake lever from the start to the checkered flag, the value is close to 9 and a half quintals.

Lwhen braking is more stressful for the braking system however, it is the one before curve 11 at 90 degrees: the MotoGP bikes arrive there a 311 km / h and brake for 5.3 seconds required to descend a 81 km / h. In this time interval the riders exert a load on the lever of 6.2 kg while the bikes travel 230 meters and the brake fluid pressure reaches up to 13.3 bar.​ ​

Source: Brembo

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