Too many modern mountain bike stems sacrifice strength & torsional stiffness for a few grams of saved weight. The Thomson X4 is the leader in strength & stiffness. The Thomson 35mm X4 stem means that you can realize the benefits of stiffer forks & stiffer 35mm bars. X4 offers precise steering, tracking & more control while riding, all wrapped up in a beautiful design. Certified to: CEN ISO 4210-5 The Thomson 35mm X4 is based on proven design. It features a traditional steerer clamp that is shaped to save weight & to be knee friendly. X4 is absolutely the best combination of strength & weight available. Thomson stems are the strongest in the industry, meaning enduro & downhill riders can run Thomson confidently. This stem body is forged AL7050 where every surface is machined. The faceplate is forged from AL6066 & 100% machined. It’s built & tested to the same standards as aerospace parts & it’s the best stem for all-around mountain biking. Leader in strength & stiffness. Precise steering, tracking & more riding control. Traditional, knee friendly steerer clamp. Machined 7050 Aluminium. Available in 32mm, 40mm & 50mm lengths