RockShox ZEB Select RC A2Performance packed, featuring an updated 38mm chassis, now compatible with new Pressure Relief Valves. 38mm chassis for increased stiffness and rider confidence Charger RC damper featuring Low Speed Compression adjust DebonAir+ is built to strike the perfect balance of what riders really want: butter like small bump feel, increased air volume to add support throughout the travel and higher overall ride height for more confidence when things get steep.