2-1/2in Coil-Over Kit 51 Series 7in

The QA1 2-1/2 inch Coil-Over Kit 51 Series with 7-inch stroke is a high-performance suspension component engineered for vehicles requiring independent wheel control and precise ride tuning. This coil-over assembly combines a 2.5-inch inner diameter spring with a 2-inch shock absorber and 5-inch sleeve, delivering the adjustability and response demanded by competitive suspension setups and serious enthusiasts who need repeatable, fine-tuned handling characteristics.

Built from aluminum construction with a natural finish, the 51 Series coil-over kit manages the full 7-inch stroke length with controlled compression and rebound damping. The 2.5-inch spring ID accommodates a wide range of spring rates, enabling buyers to match spring stiffness to their specific vehicle weight, track conditions, and desired handling balance. The integrated 5-inch sleeve provides smooth piston travel while protecting internal components from contamination—critical for durability in demanding environments where repeated suspension articulation and temperature cycling stress the system.

This kit is purpose-built for applications where height adjustment and spring preload tuning are essential—road racing platforms, autocross vehicles, or off-road rigs where driver control over suspension geometry directly affects lap times and handling predictability. QA1's 51 Series shocks are recognized for consistent performance across repeated compression cycles, making them a preferred choice for competitors and builders who value measurable, reproducible results over a broad range of operating conditions.

Coil-over kits allow independent spring and damper selection, a fundamental advantage in suspension design. Unlike fixed-rate assemblies, this QA1 configuration lets builders dial in spring frequency and shock valving separately to match their vehicle's mass, center of gravity, and intended use—whether that's maximizing cornering grip, managing weight transfer during acceleration, or maintaining consistent geometry through elevation changes.

Specs: 2-1/2 inch coil spring ID, 2 inch shock diameter, 5 inch sleeve length, 7 inch full stroke, aluminum body with natural (unpainted) finish, QA1 51 Series valve-adjustable shock assembly.