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The Bilstein 9100 Series is the culmination of more than 30 years of off-road racing shock absorber development and expertise. Working with top off-road racing teams, Bilstein was uncompromising in their design, engineering and manufacturing of the 9100 Series. Bilstein advanced their race-proven shock design and added the latest in remote reservoir and externally adjustable bypass technology to build the 9100 Series Features... Hand Assembly and Custom Valving  External Bypass Tube Placement for Greater Adjustability  Owner Rebuildable to Exact Specifications  Self-Adjusting Deflective Disk Valving System  Variable Flow Metering Check Valves for Position Sensitive Adjustability  High Flow Piston Reduces Harshness Plus... 2" & 2.5" Shock Body Diameter 10" thru 17" Travel Lengths 2.5" Diameter Remote Reservoir One-Time Free Revalve Option* * Contact the Bilstein Off-Road Racing Department for Details. Technical Specifications  9100 Series Body: 2.5" or 2" Seamless Tube Conventional or Threaded Body Rod: 22mm Centerless Ground, Case Hardened, Chromed and Super Polished Rod Guide:  Aluminum CNC Machined Seal: Rebuildable 3 Stage, Self Lubricating Piston: Bilstein Racing Piston Valving: "Self Adjusting" Deflective Disc Independent Rebound & Compression Oil: Bilstein Fade Resistant High Temperature Racing Oil Reservoir: 60mm Seamless Machined Tube Hose: Aeroquip -8 High Pressure Hose Rod Ends: 1/2" Graphite Uniball w/ CNC Machined Eye ring Top: Screw Top: CNC Machined 7075 T6 Aircraft Aluminum Weld Top: CNC Machined Steel  Finish: Electroless Nickel Bypass Hardware Externally Adjustable Variable Flow Metering Check Valves  Available in 5/8" & 7/16" Tube placement is custom per application Dual Rate Coilover Hardware Billet Aluminum CNC Machined Black Anodized w/ Delron Spring Slider. Available for 2 1/2", 3", & 3 5/8" Springs