Hi John:

That same bike is hanging in my garage, and it's been through everything from a 12-hour mtb race, to adventure races, to poking around my neighborhood. In fact, I only replaced it with the Santa Cruz about three months ago.

So anyway - as you've seen, singletrack is basically a path only wide enough for one bike (going whichever way). Singletrack is usually more technical than a fire road (technical = hard), and is also usually lots of fun

I think Trek put it on the bike to "prove" it was a real mtb...but I can tell you it's practically bullet-proof. Good luck with it.