Adjustable rebound Adjustable preload Nitrogen charged with independent floating piston (IFP), adjustable from 115-145 PSI Excellent damping characteristics 18kg spring Supports riders in the 170-240 lb. range Rebuildable Product Description The X100FBD rear shock is even better than before! We kept the fat 45mm main tube from the previous version, but lost the weight by using 6061 cold-forged aluminum instead of steel. This body size allows for a larger piston, shim stack, and fluid volume compared to the stock shock. It will absolutely transform the rear end for adult riders of Honda XR100/CRF100/XR80 minibikes, with bolt-on and go simplicity!