Figure proper spring rate

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2/5/2019 6:51 AM

So I know static sag should be between 30 & 40 mm, with race sag at 100mm if the spring is right! ( if you have 40mm static & only 95 race sag then you need to go up a rate)
My question is , so these guys running 108 to 110 mm of race sag! Is the same formula used to determine the proper spring rate?

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2/5/2019 8:14 AM

DB505 wrote:

So I know static sag should be between 30 & 40 mm, with race sag at 100mm if the spring is right! ( if you have 40mm ...more

You would go down a rate (softer) with 40mm static and 95mm race sag. 105mm is a good starting point and is figured the same way (30-40mm static).

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Take it to the limit, one more time!

2/5/2019 11:12 AM

I think you are mistaken, but thanks for the response

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2/5/2019 11:45 AM

DB505 wrote:

I think you are mistaken, but thanks for the response

I am not mistaken. Here is a little tutorial on spring rates.

https://motocrossactionmag.com/bones-bacon-on-suspnsion-static-sag-versus-spring-rate/

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Take it to the limit, one more time!

2/5/2019 11:53 AM

DB505 wrote:

I think you are mistaken, but thanks for the response

MX317 is correct. If you're at 95 and trying to get to 100 you would loosen your adjuster, less preload. This would in-turn create more free sag (if you're at 40 it would foreseeably go to 45). Meaning your spring rate is too stiff and must be softened. Here is a link you might want to read.

https://motocrossactionmag.com/bones-bacon-on-suspnsion-static-sag-versus-spring-rate/

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2018 KX450F
2005 KX250
2003 KDX 220
1984 KX 80
1982 RM 80
1980 RM 80
1977 XR 75
1969 Honda Mini 50

2/5/2019 11:54 AM
Edited Date/Time: 2/5/2019 2:40 PM

Kind of funny we both posted the same link, I guess I should type a little faster. lol

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2018 KX450F
2005 KX250
2003 KDX 220
1984 KX 80
1982 RM 80
1980 RM 80
1977 XR 75
1969 Honda Mini 50

2/5/2019 12:03 PM

I stand corrected! Thanks!

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