The Australian MotoGP race, already due to feature the first ever mandatory pit stop, has now been changed even further.

Instead of a 26-lap distance (one less than the original length) and a maximum of 14 laps on one set of tyres, the race has now been reduced to just 19 laps, with no more than 10 laps before riders must pit and swap to their spare bike.

A further revision is that the lap limit now applies to slick and wet tyres, meaning even if it rains riders will still have to swap bikes at least once.

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The upheaval has been triggered by increased tyre heat generated by the new Phillip Island surface, which has caught out both Bridgestone (MotoGP) and Dunlop (Moto2). The Moto2 race distance has been slashed from 25 to 13 laps.

The latest update from Race Direction can be seen in full below:

"Following further problems during the morning warm up we have been notified by Bridgestone that they are unable to guarantee safety of their rear slick tyres beyond 10 laps. It has therefore been decided to make the following changes to the MotoGP class race in the interests of the safety of the riders.

"1. The race distance will be 19 laps.

"2. Every rider will be required to enter the pits and change to his second machine with fresh tyres at least once during the race. In normal circumstances this means that the rider must change machine only at the end of lap 9 or lap 10.

"3. No rider is permitted to make more than 10 laps on any one slick or wet rear tyre. This means that a bike/tyre change before lap 9 will require a second bike/tyre change to finish the race.

"4. The above procedure is valid for a dry race or a race that starts in wet conditions. Clearly in a wet race the rider will change to a bike with wet tyres.

"5. If the race is started in dry conditions and it then rains the race will be stopped with a red flag. The restarted race will be for the number of laps required to complete 19 laps but with a maximum of 10 laps and a minimum of 5 laps.

"6. Riders using "Factory" and "Satellite" machines will be required to use the "hard" option tyre (B51DR). Extra quantity will be allocated by Bridgestone.

"7. Riders using CRT machines will be required to use CRT "hard" option tyre (B50DR). Extra quantity will be allocated by Bridgestone.

"8. The pit lane speed limit zone will be extended both on entry and exit, and the exit route to rejoin the track will be marked by a white line in the runoff area. Crossing this line whilst rejoining the track from pit lane will result in a penalty."