I was fixing a flat yesterday on my tubeless DH rims (823s?) and was in the process of pumping them up. I was using a Maxxis tubeless tire with some Stan's home-made slime stuff in case of punctures. Noremally, at a certain pressure you hear the little pop of the tire seating on the rim, but not this time. Curious!! I kept on pumping... Nothing... 30lbs 40lbs 50lbs 55lbs At about 55lbs I stopped and picked up the wheel to listen for leaks or something. As soon as I got the tire up near my head... BOOM!!! The tire blew right off the rim. It sprayed stan's mix all over my face, in my hair, on my clothes, and up to 15feet down the driveway. It even exploded with enough force that it somehow even blew up my hub!! Pawls were on the ground, the casette was over in the grass... About 15 seconds later, my neighbors started soming out and exclaiming WTF is going on!! There I am covered in green slime, my hair was blown backwards like david lynch, hub parts and slime all over the place, I even cut/bruised my hand some how. Everyone kept asking me if I was OK... And this was only 55lbs of pressure!! So I guess the lesson here is that you should maybe bounce the tire a few times before you put it up to your face. I could have easily gotten slime in my eyes. YUCK!! I'll probably get a knock on the door later today from Homeland Security.