Thomson Elite X2 StemThe Thomson X2 features a lighter, 2 bolt handlebar clamp. The interlocking handlebar clamp of the X2 makes it as torsionally strong as other 4 bolt designs, while being lighter and narrower. Description X2 is for the rider who understands what it takes to stay up front. Energy wasted in flex is the enemy on a road bike. X2 keeps your energy moving forward. The Thomson X2 Road stem allows you to realize the benefits of stiffer forks and stiffer 31. 8