I finished work yesterday and took off with the bike. There is a road construction zone and I had to ride across a square road shoulder, made a little bump. Shortly after I felt some vagueness riding on the highway. I stopped to pick up some groceries and finally found the rear tire flat. I discharged a bottle of inflatable tire sealant, the tire filled up enough so I could get home. I found no hole when I inspected the tire. I had a set of Kenda Big Block installed a couple weeks ago. I checked the rear tire tonight and air pressure is ok. Is there a possibility that a knob got pushed in when riding on the square edge and the bead got broken letting air out??? Or it may be a joker being not funny!!