I'm going to compile a quick list for reference of the typical spring rates used. I don't think anyone will be going softer than 250 lb/in.=)

700 lb/in = 12.5 kg/mm

650 lb/in = 11.6 kg/mm

600 lb/in = 10.7 kg/mm

550 lb/in = 9.8 kg/mm

500 lb/in = 8.9 kg/mm

450 lb/in = 8 kg/mm

400 lb/in = 7.1 kg/mm

350 lb/in = 6.2 kg/mm

300 lb/in = 5.3 kg/mm

250 lb/in = 4.5 kg/mm

For the metric rated Eibach or other springs there is an equation to decipher them.

For instance someone recently asked what their GC metric spring was. Here's the breakdown.

Eibach spring numbers

125.64.75

To get the conversion for this you would multiply the n/mm x 5.714 = lb/in

Similar to the US Eibach springs the first number (125) is the length in mm, (64) is the diamater in mm, and (75) is the newtons/mm.

So this spring is 5" long spring, 2.5", and is 428.5 lbs/in.

(Length of spring in inches) (Inside diameter of spring) (Distance to coilbind in inches)

600-250-450 3.51"

600-250-500 3.5"

600-250-550 3.49"

600-250-600 3.43"

600-250-650 3.43"

600-250-700 3.17"

700-250-350 4.24"

700-250-400 4.29"

700-250-450 4.09"

700-250-500 4.06"

700-250-550 3.84"

700-250-600 3.78"

700-250-650 3.77"

**Spring Rate Equivalencies**700 lb/in = 12.5 kg/mm

650 lb/in = 11.6 kg/mm

600 lb/in = 10.7 kg/mm

550 lb/in = 9.8 kg/mm

500 lb/in = 8.9 kg/mm

450 lb/in = 8 kg/mm

400 lb/in = 7.1 kg/mm

350 lb/in = 6.2 kg/mm

300 lb/in = 5.3 kg/mm

250 lb/in = 4.5 kg/mm

For the metric rated Eibach or other springs there is an equation to decipher them.

For instance someone recently asked what their GC metric spring was. Here's the breakdown.

Eibach spring numbers

125.64.75

To get the conversion for this you would multiply the n/mm x 5.714 = lb/in

Similar to the US Eibach springs the first number (125) is the length in mm, (64) is the diamater in mm, and (75) is the newtons/mm.

So this spring is 5" long spring, 2.5", and is 428.5 lbs/in.

**Here's a few of the typical spring setups and their distance to coilbind measurements**(Length of spring in inches) (Inside diameter of spring) (Distance to coilbind in inches)

600-250-450 3.51"

600-250-500 3.5"

600-250-550 3.49"

600-250-600 3.43"

600-250-650 3.43"

600-250-700 3.17"

700-250-350 4.24"

700-250-400 4.29"

700-250-450 4.09"

700-250-500 4.06"

700-250-550 3.84"

700-250-600 3.78"

700-250-650 3.77"

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