To unlock the Pro bikes you have to beat the Pro Bosses. Each Pro Boss you beat will unlock a different Pro bike. You unlock the Pro bikes in the following order. * Pro Bike 6 - beat Super Shrimp * Pro Bike 5 - beat Up Chuck * Pro Bike 4 - beat Wonder Wind * Pro Bike 3 - beat Limitless Liz * Pro Bike 2 - bea...
Each bike in the game has two versions. A Pro version and the standard or regular version. The Pro version is designated by the star icon as shown below on the left bike. The difference between the two is how much their attributes can be upgraded. For example, the regular Bike 5 can only be upgraded a limited amou...