All bikes:
     At the Bike select, press Left(3), Up, Down, Right(3), Circle.

All styles:
     At  the  Style  select, press Left, Left, Up, Right, Right, Down,
Left, Right, Circle.

All levels:
     At  the Level select, press Left, Right, Left, Right, Up, Up, Up,
Circle.

Unlock Slim Jim:
     At  Rider  select,  press  Up, Up, Left, Left, Down, Down, Right,
Right, Circle.

Unlock Amish Boy:
     At  Rider  select,  press  Down,  Down, Up, Up, Down, Down, Left,
Left, Circle.

Unlock Lunch Lady:
     At  Rider select, press Up, Down, Up, Down, Up, Down, Left, Left,
Circle.

Unlock Eighties rider:
     At  Rider select, press Left, Up, Up, Right, Up, Up, Left, Right,
Circle.

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Original Mode:

All bikes:
     At  the  Bike  select, press Up, Left, Up, Down, Up, Right, Left,
Right, Circle.

All styles:
     At  the  Style  select,  press Left, Up, Right, Down, Left, Down,
Right, Up, Left, Circle.

All levels:
     At  the  Level  select,  press Left, Up, Right, Down, Left, Down,
Right, Up, Left, Circle.

Unlock Slim Jim:
     At Rider select, press Down, Down, Left, Right, Up, Up, Circle.

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Big skid:
     In  the  high school go to the ramp next to the big staircase and
ride  up  it  at top speed when you reach the top push down and to the
right  then  let  go  of the peddel button. If done right you can do a
skid  that will measure in the hundreds of feet. You might have to try
a  few  times but it does work. I discoverd this by sheer accident, so
good luck on the killer skid record!