For 49mm conventional forks. Adj. pre-load. Asymmetrical monotube suspension design is used in the latest top-end sport bikes and motocross applications. True High Performance and the best Progressive Suspension has to offer. Since the best damper is a large damper, this damper is so large it leaves no room for a spring. The aluminum sealed deflective disc cartridge damper system is nitrogen filled to reduce oil foaming. The oversize spring system is installed in the other fork tube and comes with externally adjustable pre-load. Kit provides great road holding, gives no fork flex issues and is available in stock and lowered heights. It will lift your bike to new unmatched ride levels, outperforming any suspension upgrade on the market today. Note: See 576008 for standard height.