The design team for the new thomson x4 had a tough goal make a stem better than the thomson elite 254 early tests showed us that our competitors 318 stems were heavier and weaker than our thomson elite 254 at thomson the x4 was not done until it was stronger lighter and longer lived than the legendary thomson elite the thomson x4 stem allows you to realize the benefits of stiffer forks and stiffer 318 bars x4 offers precise steering tracking and more control while riding all wrappe