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To backflip the bike and the rider in the PS3 you just have to press the trick modifier button and then pull L3 from up to down To perform a 360 you just have to press the trick modifier button and then pull L3 from left to righ or from right to left
With this tricks you can do ALL the other ones (even Rock solid, Sidewinder or No hands can) so you can see funny things like the rider running by the bike and flipping at the same rythm
Backflips are easy to control and you can even double backflip any trick but 360s are harder to control and to land and it's VERY difficult to do a double 360 (720º degrees)