Any of you fellows know how to calculate spring rates? - Custom Fighters - Custom Streetfighter Motorcycle Forum

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Old Streetfighter Motorcycle Forum Post 05-05-2020, 11:19 PM   #1
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Default Any of you fellows know how to calculate spring rates?

I'm converting a Honda CX500 into a monoshock suspension using a Honda CBR954RR Showa shock. I'm hoping you can help me find an appropriate spring for this project. I don't know what information you might need to help me sort this out, or if sorting this out is even a thing you can help me with, but I'll try and include as much as I know.

The shock is mounted 120 to the swingarm. The swingarm is 19 inches long from pivot to axle. The lower shock mount is located 4 inches from the pivot. Curb weight of the bike is as of yet unknown, but I'm expecting it to be close to 500lbs with me on it.

Any help you could lend on this matter would be great appreciated.

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Old Streetfighter Motorcycle Forum Post 05-05-2020, 11:34 PM   #2
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Default Re: Any of you fellows know how to calculate spring rates?

Oh shit, that sounds like a lot of maths

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Old Streetfighter Motorcycle Forum Post 05-05-2020, 11:37 PM   #3
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Default Re: Any of you fellows know how to calculate spring rates?

a LOT of math
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Old Streetfighter Motorcycle Forum Post 05-06-2020, 08:46 AM   #4
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Default Re: Any of you fellows know how to calculate spring rates?

I would start by sitting on it, see how much it sags/dont sag.

No math needed

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Old Streetfighter Motorcycle Forum Post 05-06-2020, 08:58 AM   #5
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Default Re: Any of you fellows know how to calculate spring rates?

It sags all the way.
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Old Streetfighter Motorcycle Forum Post 05-06-2020, 10:41 AM   #6
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Default Re: Any of you fellows know how to calculate spring rates?

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Originally Posted by makenzie71 View Post
It sags all the way.
You have almost 5 to 1 leverage on that shock!! that is going to take a hefty spring.
Hornets have a very heavy spring, but they only have 3 to 1 leverage

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Old Streetfighter Motorcycle Forum Post 05-06-2020, 11:10 AM   #7
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Default Re: Any of you fellows know how to calculate spring rates?

It is going to need a pretty heft spring. I've actually got a 650 Ninja shock coming to try it out...of course it's a crappy shock with no adjustability but it'll let me test out a 17.3kg/mm spring...and I might even be able to swap it to either my 954RR shock or one of my better, newer models in the pile.
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Old Streetfighter Motorcycle Forum Post 05-06-2020, 02:18 PM   #8
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Default Re: Any of you fellows know how to calculate spring rates?

subd because I have no idea how this is figured out...

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Old Streetfighter Motorcycle Forum Post 05-08-2020, 03:27 AM   #9
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Default Re: Any of you fellows know how to calculate spring rates?

To consider: you'll be changing the spring rate of that shock so much, the damping may not be adequate. You'll probably need to get it revalved

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Old Streetfighter Motorcycle Forum Post 05-08-2020, 03:29 AM   #10
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Default Re: Any of you fellows know how to calculate spring rates?

Is the basic shape of it... Rear shock will carry around 300lb, multiply by 5 due to leverage and get 1500lb spring? A blackbird has about a 1000lb spring. A cb-1 has about 1100lb. Those are the highest rates I know offhand.

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