X4 aluminum layshaft is strategically CNC-machined to attenuate rotating weight without compromising strength or integrity. The accuracy layshaft minimizes runout, eliminating drivetrain vibration and producing a positive stability. The layshaft includes two exchangeable bearings to help expand decrease drivetrain vibration. The layshaft features super slim design and a square form where in fact the pulley is keyed on set up. The pulley is guaranteed by an O-ring and/or C-clip with regards to the motorist choice. Machined from premium Swiss 7075 T6 aluminum and black colored anodized.