Eibach Spring Rubber – 2.5in ID, 50 Durometer (Black) – Part #SR.250.0050 Fine-tune your coilover setup with the Eibach 50 Durometer Spring Rubber, the softest rate option in Eibach’s professional tuning lineup. Designed for 2.5-inch inside diameter coil springs, this black polyurethane insert is ideal for applications requiring subtle rate progression—perfect for improving compliance, traction, and driver comfort on uneven terrain or variable track conditions. Adding approximately 0.75 inches of solid height, this insert allows easy adjustment of spring preload and ride height without disassembly. The 50-durometer compound offers smooth and predictable engagement, making it a go-to choice for racers dialing in the last 5% of suspension performance. Key Features: Softest Rate Option: 50-durometer design provides mild stiffness increase for better compliance. Tunable Ride Characteristics: Adjusts spring rate and preload with minimal setup time. Durable Polyurethane Construction: Maintains flexibility and strength under heat and stress. Fits 2.5" Coil Springs: Engineered for Eibach ERS and similar linear-rate coilovers. Height Adjustment: Adds ~0.75" of solid height for preload fine-tuning. Made in the USA: Built to Eibach’s proven motorsport standards. Application Notes:Sold individually. Compatible with Eibach and other 2.5” coil springs. Also available in higher durometers (60, 70, 80, and 90) for custom rate control. Why Buy from Fenix MotorsportsAt Fenix Motorsports, we don’t just sell performance parts—we use them. Every Eibach product we carry is proven in the field and backed by real-world testing. Enjoy same-day shipping, expert support, and quality you can trust from one of the top aftermarket suppliers for race and off-road suspension.
