"The Trike's got an amazing power system. One crystal will keep it going for days, and thanks to those big wheels and that suspension system, it zooms at max-speed over any surface you can name."
7694 MT-31 Trike is a Mars Mission set released in 2007. The set included a space vehicle, and two minifigures.
This is a description taken from LEGO.com. Do not modify it.
Explore any terrain!
The Mars Mission team can transport energy crystals and captured aliens anywhere across the Martian surface with the all-terrain MT-31 Trike vehicle with working suspension system!
Includes astronaut minifigure and glow-in-the-dark alien minifigure!
Trike has all terrain wheels and suspension!
Due to the similar design, part count, and name, this set could be considered the spiritual successor or remake of 7312 T3-Trike, released in 2001 as part of the Life on Mars theme which was also set on Mars.
In the LEGO Club Magazine, it is described as having "Cable-Reinforced All-Terrain Tires", a "Vulcan-5 High-Tension Motor Coil" and "Omni-Torque Suspension System.