Thomson Elite X4 31.8mm Stem
The Thomson X4 is stronger and 30 grams lighter than the Thomson Elite 25.4 mountain stem, and features a traditional steerer clamp that is shaped to save weight and be knee friendly. The X4 is absolutely the best combination of strength and weight available.
This is my third Thomson Elite X4 stem. I will keep using these until someone makes one lighter, stiffer, and better looking. Thomson quality is the best. Thomson seat posts are great too.
I only use Thomson stems on my bikes. I have a 50mm on my Pivot Firebird, a 70mm on my Pivot Mach 5.7 and a 90mm on my Vetana El Ciclon and all of them are just awesome. The quality is unbeatable, clamp firmly and evenly and they look great.