It's marketed in the U.S. by Jeep. Called the Rubicon, mfg. by them. Here's
a link:
http://www.i4u.com/article443.html   scroll down once you get there.
Several mt. bike magazines have reviewed it. A little heavy for an "uphill,
climbing" type bike but effective according to the testers.

Bob

> Just on a site note, I have seen a 2WD mountain bike before.  Pretty neat
> setup.  There is a speedometer like cable that runs from the front to rear
> wheels of the bike with a cog at each end that is driven by the wheels -
> I'll take the Yamaha though!
>
> David Marshall