King PR2518-SSPB-AI 2.5 Performance Race Smoothie Shock 18" Travel Piggyback IBP

The King PR2518-SSPB-AI is a premium 2.5-inch Performance Race Series smooth body shock absorber featuring 18 inches of travel, specifically engineered for demanding off-road and racing applications. This advanced shock combines piggyback reservoir design with Internal Bypass Piston (IBP) technology and an adjustable compression adjuster for ultimate performance and tunability.

Advanced IBP Technology:

The Internal Bypass Piston design utilizes a full-diameter piston with an integrated metering needle that progressively reduces fluid flow near the end of travel. This innovative approach delivers bypass-like bottoming control and progressive damping characteristics in a more compact package, making it ideal for applications where space constraints or class rules prohibit traditional external bypass shocks.

Key Features:

• 2.5-inch bore diameter for exceptional damping capacity
• 18 inches of wheel travel (28.0" collapsed, 46.0" extended)
• Piggyback reservoir configuration for improved oil capacity and cooling
• Internal Bypass Piston (IBP) for progressive damping and bottoming control
• Compression adjuster for easy trackside tuning without disassembly
• 7/8-inch hard chrome shaft with 100,000 PSI tensile strength
• 6061 aluminum alloy piston for lightweight performance
• Precision honed cylinder bore (+/- 0.001 inch tolerance)
• Teflon-lined stainless steel spherical bearings at mounting points
• 1/2-inch ID heim with 1.5-inch mounting width
• Long-wearing urethane seals for extended service life
• Heat-treated stainless alloy valve shims
• Fully rebuildable and serviceable with common hand tools

Performance Race Series Quality:

Built to the same exacting standards as King's top-tier race shocks, the PR2518-SSPB-AI features precision-machined components manufactured in-house at King's California facility. Each shock is designed for use with existing coil springs, torsion bars, or leaf springs, offering professional-grade performance for pre-runners, rock crawlers, desert racers, and serious off-road enthusiasts.

The compression adjuster allows drivers to dial in damping characteristics on the fly, while also preventing cavitation under extreme conditions. Custom valving is available at no extra charge to match your specific vehicle setup and driving style. Sold individually.