Speed Kings

Cheat mode:
The following codes must to be entered as a handle name. To do this, choose a type of race (time attack, single race, etc.. Then, select the motorcycle that you want to use and select "Continue". After that, a screen where you can choose your outfit, gloves, helmet, etc. will appear. On that screen is an option for "Handle". Select it, then type in the following handle name to activate the corresponding cheat function.
Sum Guy.

Master code:
Enter borkbork as a name. This code also unlocks the Secret Nevada meet, the Casino Run course, and six more leathers, all GP modes, all bikes, all lids, and lap times.
Raj gill and Sum Guy.

Respect points:
Start a new game and enter .resp followed by a space and a number (for example, .resp 30) as a name to begin with the indicated amount of respect. Note: Enter .resp54 to unlock all six respect bikes.

Finish all nine driving tests with gold:
Start a new game and enter .test9 as a name.
Sum Guy.

Win all six meets:
Start a new game and enter .meet6 as a name.
Sum Guy.

New meets, street racer bikes, and more courses:
Start a new game and enter .meet4 as a name. You will unlock the New England, Detroit, London, and the Swiss Alps meets; five street racer bikes; and sixteen additional single race, time attack, trick attack, and head to head mode courses.

GP Mode completed:
Start a new game and enter .prix as a name.

Additional mirrored GP modes:
Enter .prix3 to unlock three more mirrored modes in the Grand Prix.

Best laps and Grand Prix unlocked:
Start a new game and enter .lapt18 as a name.
Sum Guy.

All tracks:
Win a gold medal in each event.
Devin.

Grand Prix mode:
Beat the top record in time attack mode.
Devin.

Hint: Quick start:
Hold Gas + Skid, then release Skid after the countdown.

Hint: Tricks:

Wheelie: Hold the Left Analog-stick Back.
Standing Wheelie: Press Trick + Left Analog-stick Back.
Surfing Wheelie: Press Trick + Kick/Punch + Left Analog-stick Back.
Cross Surfing Wheelie: Press Trick + Left Analog-stick Back + Front Brake + Kick/Punch.
Endo: Press Left Analog-stick Forward + Front Brake.
Surfing Powerdown: Press Trick + Left Analog-stick Forward + Power Down.
Handstand Powerdown: Press Trick + Skid + Left Analog-stick Forward + Power Down.
Surfing: Press Trick + Left Analog-stick Forward, then Left Analog-stick Back.
Handstand: Press Trick + Left Analog-stick Forward, then Kick/Punch
Pavement Ride: Trick + Left Analog-stick Forward, then Skid.
Donut: Hold Brake + Gas and turn in one direction with the Left Analog-stick.

Hint: Back and frontflip:
Get a powerdown and boost it about 350 feet before a ramp. When you are in mid-air, hold Up or Down to perform a backflip or a frontflip. Note: You need a lot of speed and a very fast bike.
darioandrea

Hint: Dodge cars while turning:
While turning, press R. Wait until you are in front of a car and point the Left Analog-stick the opposite way that you are turning. You will keep turning, but at a slower rate. Note: Do not release R until you dodge the car(s).
Crash62491.