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Old Nov 16, 2007, 10:31 AM   #1
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Spring rate conversions kg/mm to lbs/in

I was looking through the spring rate chart for various vendors, and thought this might be useful.

1lb = 0.45359237kg
1in = 25.4mm

.45359237 / 25.4 = .017857967322834645669291338582677

So now we know that 1lb/in = .017857967322834645669291338582677.

So if we want a spring that's roughly 560lbs; we'd multiply both sides by 560, and come up with roughly a 10k spring rate. Alternatively if you already know the kg/mm rate and want to find out what the lbs/in is, just divide the spring rate by that reaaally long factoral above (the .0178...).

But just in case you all didn't want to go through all that, here's a chart:

kg/mm to lbs/in
-----------------------------
16 = 896
15 = 840
14 = 784
13 = 728
12 = 672
11 = 616
10 = 560
9.0 = 504
8.5 = 476
8.0 = 448
7.5 = 420
7.0 = 392
6.5 = 364
6.0 = 336
5.5 = 308
5.0 = 280
4.5 = 252
4.0 = 224
3.0 = 168
2.0 = 112

Last edited by belizelittle39439; Nov 16, 2007 at 10:37 AM.
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Old Nov 16, 2007, 10:41 AM   #2
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This is handy, you'll have to check the author's math:

http://www.hraefn.net/projects/spring_rates.php
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Old Dec 10, 2007, 07:10 PM   #3
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Or. Just ask google...see:

http://www.google.com/search?q=700+l...ient=firefox-a

http://www.google.com/search?num=100...in&btnG=Search

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Old Dec 10, 2007, 07:45 PM   #4
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Smartass! ; )

If I'd had known it was that easy I wouldn't have done the calculations! But at least it's nice knowing how the calculation is done...
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Old Mar 20, 2010, 08:31 AM   #5
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I wondered what AWD Motorsport D2 coilover sping rate is. Anyone know?
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Old Mar 20, 2010, 08:31 AM
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10k, 3kgmm, 85, chart, conversion, conversions, kg, kgmm, lbs, lbsin, mm, por, rate, rates, spring

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