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kg/mm to lbs/in Spring Rate Conversion

 
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Old 08-26-2010, 06:12 PM
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kg/mm to lbs/in Spring Rate Conversion

I know this might not help everyone but it will help a select few I'm sure.

Companies very when it comes to using kg/mm and lbs/in so I thought this would help people out depending on what system you use when choosing a spring rate.

1lb = 0.45359237kg
1in = 25.4mm

.45359237 / 25.4 = .017857967322834645669291338582677

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 really 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


Thanks to the guys over at the Evo forums for this information.
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Old 08-26-2010, 09:11 PM
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Re: kg/mm to lbs/in Spring Rate Conversion

nice, good job. i've always wanted to see one of these.
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Old 08-27-2010, 10:47 AM
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Re: kg/mm to lbs/in Spring Rate Conversion

Nice write up!
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Old 08-28-2010, 01:49 AM
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Re: kg/mm to lbs/in Spring Rate Conversion

Sweet, didn't realize this was going to be sticky worthy.

Kev, you know I had to figure this out since the type 2.5s were in kg/mm.
Laaame.

Oh well.

Hope this helps some people.
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Old 06-01-2011, 01:33 AM
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Re: kg/mm to lbs/in Spring Rate Conversion

What are stock 5th gen base ludes lbs/in?? Cuz I wanna go stiff but idk how much stock is lol
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Old 06-02-2011, 06:27 PM
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Re: kg/mm to lbs/in Spring Rate Conversion

Don't hold me to it but I remember reading somewhere that it was something like... 200f and 150r...
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Old 06-02-2011, 07:10 PM
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Re: kg/mm to lbs/in Spring Rate Conversion

ok so stiffest you would want to go for the "hella slammed" look would be....? lol
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