air can upgrade kit megneg 1852 10x475 55mm includes air cann eg volume spacers seals greThe RockShox Air Can Upgrade Kit MegNeg is an advanced tuning kit designed for RockShox Deluxe A1 B2 and Super Deluxe A1 B2 shocks. The MegNeg (Mega Negative) chamber increases the negative air chamber volume, allowing for more responsiveness in the initial stroke and better support in the mid stroke . This results in a smoother and more progressive suspension experience, especially over challenging terrain. Product features: Compatibility Fits