Alright, the green bar is boost. The red bar is Freakout. If the red bar maxes out, you press L+R as your trick to do your Uber Trick. Thus you freek out. While freeking out, you have a timer. That timer decresses, unless you do a trick, then the difficulty of the trick tells you how much time you get back. While freeking out, you are infinitly boosting. The 5 tricks is wrong. B is tweak(i.e. change a trick mid trick). I wont say the tweak, but every trick can be tweaked. A ":" indicates to hit right after.
L, R, L+R, L:L, R:R, L+R:L+R, L:R, R:L, L:L:L, R:R:R, L+R:L+R:L+R, L:L:R, R:R:L, L:R:L, R:L:R, L:L+R, R:L+R, L+R:L, L+R:R.
I think that is it. I have noticed that some of the earlier bikes do not do some of the more complex ones, but I may be wrong. If you know some more, then post plz.