Conv Rear Spring 5in x 13in x 300#

The AFCO Racing Products Conv Rear Spring 5in x 13in x 300# (part number 25300-1B) is a conventional coil spring engineered for suspension tuning in high-performance and marine applications. This rear spring delivers precise load control through its 300 lb/in spring rate, making it ideal for vehicles and watercraft that demand consistent handling characteristics across varying load conditions and driving or operational scenarios.

Specifications on this AFCO coil spring reflect purpose-built racing and marine engineering. The 5-inch outer diameter and 13-inch length provide the geometry needed for rear suspension mounting in compact applications, while the 300 pound-per-inch rate strikes a balance between responsive handling and ride comfort. Black powder-coat finish protects against corrosion—critical for marine environments where salt spray and moisture exposure accelerate rust. At 7.15 lbs, the spring's weight is negligible in overall vehicle dynamics but contributes to the precision tuning AFCO is known for. Each unit is sold individually, allowing buyers to upgrade one corner or build matched sets for complete suspension overhauls.

This spring suits racers, marine restoration enthusiasts, and performance builders who prioritize suspension accuracy. Whether upgrading a classic speedboat's handling or dialing in a high-performance vehicle's rear geometry, the 300# rate offers enough stiffness for spirited use without sacrificing day-to-day drivability. Buyers integrating this spring should verify mounting compatibility with their specific platform and consult suspension geometry specs before installation.

AFCO Racing Products has built credibility in the performance suspension market through decades of supplying OEM and aftermarket shops. Conventional coil springs of this specification are standard in competitive and restoration applications where spring rate consistency and corrosion resistance matter.