Tires that bulge asymmetrically after you've mounted them are uncool to the highest degree of uncool. They indicate improperly seated tire beads, which can not only make tubeless setups impossible and damage inner tubes, but they throw off your bike's rotational balance and high speed stability. They can be catastrophic in hard cornering or technical handling situations, too. The Unior Tire Setter Tool helps you grab a tire's sidewalls with leverage to straighten them out with greater power and control than hands alone. Made of chrome vanadium steel to stand up to years upon years of use.