Convert spring rates? Math test!
 

Okay, all you math wizards, let's see if you can convert these metric spring rates for some coil-overs we bought for the Boxster...

front 6.0 kg/mm
rear 8.7 kg/mm

Good old pounds would be something that I can process :confused:

1 kilogram = 2.20462262 pounds
So 6kg=13.22773572 pounds
and 8.7kg=19.1802216679 pounds
Is that what you where looking for?
Randy
PS, Google is your friend. (-;

Actually found something a little different...

Re: spring rate conversion
by Robert Fogt on 03/16/05 at 12:40:09

Springs are rated in pounds/inch in the U.S., and Newtons/millimeter elsewhere. I have not seen kilograms/millimeter before, but the conversion will be easy enough.

1 pound = 0.45359237 kilogram
1 inch = 25.4 millimeter
0.45359237/25.4 = 0.0178579673228346

The conversion factor is 0.0178579673228346

So, to convert lb/in to kg/mm you multiply by 0.0179 and to convert kg/mm to lb/in you divide by 0.0179

So that would mean...

Front 335
Rear 486

...which sounds about right.