Tracker 2.0 Pressurized Shock Absorbers: Tracker 2.0 pressurized shock absorber features 2-way, infinitely tuneable adjustment (preload-rebound), black anodized CNC billed full body (not die cast), Heavy duty 16mm shaft diameter. ODC Suspension features Eiback springs specifically made for ODC! Preload adjustment tool is included. Available in lengths of 12.8", 13.5" and 14.2".