DETERMINING SPRING RATE.

All Eibach motorsport springs are tested between 20% and 70% of the spring's total travel.
This spring rate can be measured easily using the following steps:

Example Spring—Standard: 1200.250.0500 (12"Free Length, 2.5"ID, 500lb/in)
Metric: 0300.060.0100 (300mm Free Length, 60mm ID, 100N/mm)