Ritchey WCS C220 Stem 130mm 31.8 Clamp + 6 1 1 4" Aluminum Blatte Weight 123 A compact lightweight hand pump A compact lightweight hand pump with an efficient overlapping Composite Matrix handle the Lezyne HV Drive features a CNC machined aluminum barrel and piston and is optimized for high volume applications The proprietary design has an ovality of 10% and a timing of 112 degrees after top dead center which provide the benefits of an oval ring without the traditional downsides of oval rings Bolt forces are aligned with the clamp so that the stem body embraces the handlebar which is less prone to damaging lightweight bars font weight:350