I was looking at the Trek DS line and I just don't see the perfect fit for me. I am a bit heavier so I had some concern for the components at the under $1K price. I like the look of the XCal, but would still like a bit more road riding ability. Anyone using a thinner tire to create their own DS with the Xcalibur? Does it work for you and what type of tire are you using?
any mountainbike can be ridden on the street and MUPs.
I find the fastest, long-wearing tires that perform well in the dirt are the Geax AKA or Saguaro. (hardpack or all-around, respectively)
if you have two sets of wheels, you can use slicks or semi-slicks on your MTB. another good choice is to have a second bike. a MTB with one set of wheels and wearing slicks is a sure sign someone bought the wrong bike, but as long as they're happy I'm happy for them.