There are a total of 50 unique jumps all over the city. Using the PCJ600 bike is usually the best way to make these jumps since it is really fast. You also have to land in a specific area to make the jump. Making all 50 jumps will count towards 100% completion of the game. The numbers of the jumps are the same as the numbers on the maps you can find in the download section of this guide. You can also see a screenshot of the jump by clicking on the camera icon.