..a complete and utter waste on roads if ya ask me.
That must be why the road cycling forum has a clydesdale thread.

I started out at 200+lbs with a mountain bike. yay
Moved to a hybrid and then a touring bike. The most durable bike so far has been the touring bike. It is not a weight weenie bike by any means. However, It does weigh significantly less than a mountain bike and is frequently mistaken for a normal road bike.
Then again I now weigh 165lbs.
So, whatever floats your boat *shrugs*

Next year's bike will be a nice racing bike. Yeehaw!