Fox Suspension Volume Spacer Description: Fox Suspension Volume Spacers internally adjust the amount of fork mid-stroke and bottom-out resistance, allowing users to tune the performance and ride properties of their Fox Suspension. Original NA spacers are first-generation negative air spring forks using the transfer rod to equalize the air pressure; NA2 is the second generation of air spring forks where the transfer rod is removed. To express it simply: more spacers = less air volume, providing a more progressive spring curve. Features: Genuine fork internal pieces for Fox Suspension mountain bike forks Volume spacers allow users to adjust the internal volume of forks Sold individually Specifications: Compatibility: Fox Suspension 36 Rhythm Float NA2, Marzocchi Rhythm Bomber Z1