I installed new M/T racing tubes on Friday and drove 70/80 miles R/T to Brooklyn.When I pulled into the garage and got out of the car I noticed the rear tire was half flat Jacked up that wheel and left. Went back in the morning and aired it up to find the leak.Finally found a small spot making bubbles so I marked it up with a yellow crayon and removed the wheel and broke it down and pulled the tube. I have NEVER seen this type of defect,,,,have you??