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Discussion Starter #1
Hey guys,

So Im busy swopping out my rear shock for a 2nd hand shock I got for a good price, ok so I put the 2 coil springs next to each other, the clean (2nd hand shock I purchased) one has 7 turns and is 11mm(rod diameter) x 72mm in diameter, the dirty one(from my bike) has 8 turns and 11.6mm x 76mm(from the top view) in diameter and is slightly taller than the new one I got.

Now would you say the one from my bike may be an upgraded spring? And whicg one would you put in?

Any quick advise would be awesome as I need to het this thing back together today.

Thanks all


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You can think of a coil spring behaving as if it is stretched out as a torsion bar, so the one with fewer turns and smaller overall diameter will be like a shorter torsion bar and will get stiffer slightly quicker as it is compressed, but it is a thinner rod, which will offset that effect. The result, IMHO, is that they would behave very similarly.
 

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Without using a precise load testing device, gazing at the springs may not provide accurate data.
What it made of, properties of the wind, etc. What weight was it DESIGNED to carry?
When I had my side car, I went to the BMW dealer and asked for the strongest springs designed for the bike since I was adding weight with the sidecar.
I wasn't guessing by looking at unknowns. The BMW springs were color coded, I think. I relied on the parts guy who is supposed to know these things.
I'd ring up some of the suspension experts here and delve into it a bit more.
 

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Discussion Starter #5
Well guys I put in the bigger one.. Lets hope for the best. At worst I can always do a quick swopout... Its a 30min job

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If you send me the following information (email it to me: [email protected]), I will tell you the spring rate of the spring.

Wire diameter
Inside diameter of the spring
overall length
Number of coils
 

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Discussion Starter #7
If you send me the following information (email it to me: [email protected]), I will tell you the spring rate of the spring.

Wire diameter
Inside diameter of the spring
overall length
Number of coils
Oh crap, I already installed it, but what I do have is the wire diameter is 11.6mm. The outside diameter is 76mm and it is 8 turns... Will that help?

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I need the free length in order to be accurate. From the photo, the "clean spring" has 8.5 coils. Measure your old springs free length and we can guess at the other's by looking at the photo. I will run some calculations.
 
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