Heavy Jet Moto Design
Although my work was not the final design in the game, the designs were based on my concept art.  
Pencil on Paper

Light Moto Design.  We hadn't started to design the rider's outfits at this point, so it was drawn for reference of how the rider would sit on the bike.
Pencil Drawing, Colored in Photoshop

Light Moto Model, showing blue turbos and orange main thrusters.
I built this before handing off the moto building responsibilties to one team member.
The early artist's staff of Jet Moto was about six, but we got up to twelve by the end of the project.
Alias Power Animator  8.0

Light Moto Model