NJB Trial Ultimates pack a list of features like nothing else on the market. Speed-sensitive compression damping and light rebound provide the ultimate ride for classic trials competition. 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 to 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 are included, as is a "fit kit" to suit 8, 10 or 12mm bolts. Your choice of 45lb or 60lb springs. Sold as a pair.