Bikes Extreme terrain bikes are more than just ordinary mountain bikes. One bike for every terrain sounds too good to be true, but it's time to wake up. Experienced downhill racer Dan Hannebrink has designed the ET, or Extreme Terrain, bicycle. And you can take it just about everywhere. By raising and lowering the air pressure, it tackles conditions that would punish a regular mountain bike.
Dual chains provide a unique drive assembly to accommodate the wide tires.
Basically, Hannebrink's design takes the typical chain ring and divides it in two, which actually gives the bike more power in the trenches. We had to design our own wheels, axles, and re-manufacture our own tires. The inspiration for the ET came from Hannebrink's downhill racing career. Just add a custom ski attachment and you've got yourself a bike to train year-round. Since then, users have found a few more applications.