Here is my Specialized Hardrock: an old school mountain bike converted to single-speed, with drop handlebars from a road bike.
New rear tire and brake pads, and brand new bar tape & front tire. Only ridden once to photograph the bicycle since the front tire and bar tape have been put on.
Wide drop bars (44cm c-c) make handling rough trails easier, and they're also comfortable for commuter purposes.
It's very light, only 25-26 lbs, which is on par with some road bikes.
Recently tuned up. Everything works well & ready to go.
Fun bike!