Serpent 500915 Rear 13mm 2.2lbs Blue Tuning Spring  [SER500915]

Tuning Effects of a 2.2lbs Rear Spring

This Serpent 500915 rear spring serves as a replacement coil for rear shock assemblies that accept a 13mm diameter. The label calls out the main specs: 13mm sizing, rear fitment, 2.2lbs rate and a blue coating.

To fit, compress the spring and slide it onto the shock shaft so it seats on the spring cup or retainer supplied with your shock. Verify seating and measure ride height after installation, and compare against the stock spring to ensure correct orientation and travel clearance.

From a tuning standpoint, the 2.2lbs rate stiffens the suspension relative to softer springs, reducing body roll and altering corner bite and rebound. Tweak preload in small steps and adjust shock oil viscosity alongside to dial in predictable handling responses during test sessions.