Leaf Spring "magic number" for different shackles?

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desert_steve

Senior Member
Oct 21, 2007
2,469
31
48
phelan, ca
I know the magic number for 62's and 12" shackles is 52.5", but is there a magic number when running 62's and 9" shackles?
 

Brandon_Charley

OG Member
Dec 4, 2006
12,406
91
48
Huntington Beach
It's the pythagorean theorem.
A=spring length from eye to eye at rest/droop
B=shackle length
C=magic number

At full droop you want your shackle just shy of 90* which makes the measurements form a right triangle.
 

desert_steve

Senior Member
Oct 21, 2007
2,469
31
48
phelan, ca
Why are you using a 9" shackle?
Not enough room to run a 12" shackle above the frame. Plus Ive already ran these shackles before through the frame with great results... But for ride height and packaging reasons theyre being remounted under the frame. I was just curious if there were "magic numbers" for both 12" and 9" shackles.
69" and 420 degrees
thanks BRO!
 
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