I can also second that, I had them on my bike and one morning on the way to work on the parkway both tires went flat and I was stuck on the side of the road with two flat tires and both valve caps were blown off, I was coming out of the toll plaza accelerating when this happened and luckily not up to full speed yet, but still a scary experience, I went back to advance auto where I bought them and got my money back, I also have no clue as to why they blew off, but these should probaly be posted in the what never to put on a bike section.