I accidently put that it was shorter. I meant to say longer.....didnt notice the difference in diameter though.
I have had no trouble with fitment though of the red proceed spring. Which also strikes me as somewhat interesting as the proceed shocks uses the exact same shock. The HPI Aluminum shock. Just different spring perch, at least it looks to be....
As for it being the exact same effect, just different fit. I wouldnt go as far to state that. You could perhaps say in your opinion its the exact same.
But because a spring has the same rate or close to it doesnt mean its the same. Especially when we know for a fact that the spring is longer and smaller in diameter. This also effects performance and numbers. Also it changes when things are happening not just the max rate... I could also attempt a wider diameter spring and a shorter one and could probably also achieve similiar rates with the same coil thickness. Basically you can make a spring rate from a number of things but there are still quite a few different ways to get there.
The actual coil diameter or thickness , size , overall diameter and length all effect spring rate. Even just the metals characteristics change that and will also effect many things throughout that rate.
If you look at progressive springs vs linear as well. Two different springs and one that has two different spring rates....but as you notice same coil diameter , but gets its extra spring rate from using tighter wound coils. Also effecting when and where the spring rate increase during the bound and rebound of the shocks.
Good news though, all that info really doesnt do us all diddly squat, unless you wanted to make your own springs.
Cause all I want to know is why did hara use it? Was it due to him having not having the part or is it due to the red proceed rear giving better drive characteristics.
We do know in 9/5/2004 he had the red rears. As well during that race Thad Garner was his mechanic. Which I really think Thad would be the best to answer this. Im also wondering who was mimicking whos setup. I have a feeling its Thad who came up with the red rear.
Also given that was a year ago. Iam also guessing the spring option was out at that time. Reason why I think the red rear is better. I have tried all of them and the black front / red rear combo seems to work the best for me and fitment has never been an issue for me. I didnt even notice till you pointed it out.