I used to do small sets of stairs and dropoffs on my skinny tire, but then I had a flaming wreck when my front wheel imploded. Now I don't know that it had anything to do with my aggressive urban conquests, and I had had a wreck that day that had taken my wheel wildly out of true, and I was in fact bombing off-road at high speed at the time, but still, I learned that day that wheels really do fail and I wouldn't want to repeat.

Now if my MTB was fixed, for sure.