How to find the correct spring rate??

8/5/2017 7:54am
I have heard before that if your sag is off and you're to light you actually go with a stiffer shock spring and vice versa. Can someone give me an easy to understand suspension rundown on how this works. I understand how to set sag and what all the different types of sag do but never really understood how you go about changing shock springs whether they be to soft or to stiff. I am a light rider and I have a big bike now (RM125) and figured this would help in the future for finding the right springs when I go about setting my sag and what not.
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Paw Paw
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8/5/2017 9:34am
This is way too much to post here. I would suggest that you go to the racetech.com sight and do some reading.

Paw Paw
8/5/2017 10:23am Edited Date/Time 8/5/2017 10:25am
Paw Paw wrote:
This is way too much to post here. I would suggest that you go to the racetech.com sight and do some reading.

Paw Paw
Can I at least get a simplified version? I have two springs, a 5.2 and a 5.5 and I weight like 130 pounds. Would the heavier spring be better or the lighter?

Edit: I found a cool article http://motocrossactionmag.com/mx-education-how-to-select-the-correct-re…
mxb2
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Bowie, MD US
8/5/2017 11:05am
Paw Paw wrote:
This is way too much to post here. I would suggest that you go to the racetech.com sight and do some reading.

Paw Paw
Can I at least get a simplified version? I have two springs, a 5.2 and a 5.5 and I weight like 130 pounds. Would the heavier...
Can I at least get a simplified version? I have two springs, a 5.2 and a 5.5 and I weight like 130 pounds. Would the heavier spring be better or the lighter?

Edit: I found a cool article http://motocrossactionmag.com/mx-education-how-to-select-the-correct-re…
Race tech.com. Or call a suspension shop.
opyguy
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Boston, MA US
8/5/2017 12:11pm
Race sag-100-110 mm
Static sag-30-45mm
That's the window you're shooting for if not you need to change Springs

The Shop

karlz
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GB
8/5/2017 1:21pm
I hope this makes sense as its sat night and i've sunk a few pints. If you set your sag 105mm for example and the static is 15mm this means the spring is to light for your weight and you have had to put preload on it, to get 105 which reduces the static sag. In the same way if you have 105mm sag and 65mm static you have had to reduce preload as the spring is to heavy for your weight. 99% of the time you will get your desired sag measurement with any spring, but at the cost of the correct static sag .

www.karlzracing.com
Paw Paw
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Benton, LA US
8/5/2017 1:41pm
Again... go to racetech.com....Put in your bike and your weight and it will tell you which spring to use.

Paw Paw
slipdog
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Nor Cal, CA US
8/5/2017 2:20pm
Paw Paw wrote:
This is way too much to post here. I would suggest that you go to the racetech.com sight and do some reading.

Paw Paw
Can I at least get a simplified version? I have two springs, a 5.2 and a 5.5 and I weight like 130 pounds. Would the heavier...
Can I at least get a simplified version? I have two springs, a 5.2 and a 5.5 and I weight like 130 pounds. Would the heavier spring be better or the lighter?

Edit: I found a cool article http://motocrossactionmag.com/mx-education-how-to-select-the-correct-re…
Neither of those springs will be close. 130# on a 125 would call for a 4.3kg/4.4kg spring
mxb2
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Bowie, MD US
8/5/2017 8:39pm
Paw Paw wrote:
Again... go to racetech.com....Put in your bike and your weight and it will tell you which spring to use.

Paw Paw
X2
Smed
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AU
8/5/2017 11:56pm
No brainer, as above Racetech, Could not be easier.
8/6/2017 4:12pm
opyguy wrote:
Race sag-100-110 mm
Static sag-30-45mm
That's the window you're shooting for if not you need to change Springs
Ok thatnks that helps to
chump6784
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8/7/2017 1:57am
That racetech calculator can be way off on springs sometimes. Their fork recommendations seem close but rear spring are way too hard, at least for me and my bike anyway.

I'd ring a suspension shop, they should be able to give you a good idea of where you should be

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