I did quite a lot of mountain biking before I got my Ninja. In 2008 I mostly did 8+ hours a week. Last year I kinda neglected that hobby though in favor of my motorcycle, but I'm aiming to do more again this year. Don't have any pics of my bike - it's not really pic-worthy as it's a just a no-brand frame with Shimano stuff. And it's mostly covered in dirt.
Btw, my 3rd set of tires on my mountain-bike are from IRC, same brand as my stock Ninja tires, and they're actually very decent. They were a lot cheaper than the high quality tires from Schwalbe I used before, have much lower rolling resistance, nearly as much grip, but way way better wear lifespan.