Park Tool BMT-1 Tire Bead Breaker. Save your thumbs and retain your sanity. The BMT-1 is designed to quickly and easily unseat virtually any bicycle tire bead with minimal effort particularly on tight-fitting tubeless systems. The locking jaws of the BMT-1 are tightened against the sidewalls using the large adjustment knob firmly squeezing the tire body. Once the long strong handle is pulled laterally in either direction the bead is pulled away from the bead seat and towards the center channel allowing for removal using a tire lever or other method. Non-marring jaw covers protect the rim and tire from damage.