The GCS 31. 8mm Stem uses a wide clamping area and a zero-degree rise to keep handling direct and precise on rough, technical terrain. Pembree put the stem through the EFBE Gravity Tri-Test, a third-party standard built for freeride and downhill demands, and machines the body from 75% recycled aluminum entirely in the UK. Corrosion-resistant stainless steel hardware locks the clamp down and keeps it tight ride after ride. What Our Gearhead(R) Experts Are Saying:"I clipped a root hard enough to jolt the whole bike, and the front end never twisted or flexed in my hands."