The Thomson Elite X4 31.8mm Stem offers precise steering, tracking and more control while riding, all wrapped up in a beautiful design. Too many modern mountain bike stems sacrifice strength and torsional stiffness for a few grams of saved weight. The Thomson Elite X4 is the leader in strength and stiffness.The Thomson Elite X4 31.8mm Stem is stronger and 30g lighter than the Thomson Elite 25.4mm Mountain Stem. It features a traditional steerer clamp that is shaped to save weight and to be knee friendly. X4 is absolutely the best combination of strength and weight available. Thomson stems are some of the strongest in the industry, meaning enduro and downhill riders can run Thomson confidently.The stem is one piece of solid 7000 series Aluminium extruded billet precision, machined by Thomson in Macon, Georgia. It’s built and tested to the same standards as aerospace parts and it’s one of Thomson's best stems for all-around mountain bike and cyclocross riding.Thomson Elite X4 31.8mm Stem SpecificationsPrecise steering, tracking and more riding control.Traditional, knee friendly steerer clamp.One piece 7000 series Aluminium.Machined by Thomson, in Macon, Georgia.Available from 40mm to 130mm lengths.40-60mm stems are available in block style only.Certified to: EN 14766 2006 MTB and DIN CERTCO: 2006 MTB