Want to see a sexy race bike? Wait until the 2012 Moto3 season kicks off and you'll see a shed load of them. Moto3 250cc race bikes will be arriving at circuits all around the world next year when they replace the 125 GP two-stroke bikes with light-weight 250cc single-cylinder four-stroke race bikes With the move to Moto3, there will be no more two-stroke World Championship races. The 2012 season will see four-stroke machines across MotoGP, Moto2 and Moto3. As for specs, the 250cc motors in Moto3 will have a maximum bore of 81 mm. Each engine should last for three races minimum and cost not more than $18,500 USD. Also, each chassis manufacturer if required should be ready to supply a minimum of 15 riders. In 2012, Moto3 will join Moto2, which debuted this year. In Moto2, 600cc 4-stroke Honda spec engines replaced the 250cc two-stroke race bikes.