NJB MX Ultimates pack a list of features like nothing else on the market. Speed-sensitive compression damping and performance-matched rebound provide the ultimate ride for classic motocross. Screw-type spring preload is quick and simple to use. A unique, two-piece body design allows the shock length to be adjusted from 13.4-15.1 inches (eye-to-eye), even while on the bike. This allows for fine-tuning the steering geometry or use on multiple machines. Can be mounted body-up or body-down. Spanners and a"fit kit"are included for fitment using 8, 10 or 12mm bolts. Your choice of 75lb or 90lb springs. Sold as a pair. Not for high-leverage-ratio applications.