• The first graph shows co-zeta for (3304) and (3171).
  • co-zeta reverse engineers compression force (co wogas) based on spring rate.
    • (3304) and (3171) both have same co-zeta at 1ips.
    • (3304) co-zeta is 8.8% stiffer at 50ips.
  • (3304) is based on a   'prel ring ls'  stack.
    • 3304 curve also fits a  '2 stage'  stack using s50sqr mv piston in a WP shock.
  • (3171) is based on a  'prel ring 1stg'  stack.
    • Note: The shims bent in Cody 3291-post and we no longer use 'prel ring 1stg' until further study.
    • This leaves us with (3304). 
    • To make a stack similar to (3171) use (3304) x .92.
    • This table shows (3171) with co-zeta curve  129_75_38_b x .92
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  • Ratio of zeta to comp force:
    • co-zeta to comp force ratio is 1-1    [e.g.  if zeta is x1.10, comp force increases 10%]
  • Ratio of spring rate change to comp force:
    • spring rate change to comp force is the sqrt difference of the springs
      [e.g.  sqrt(5.2) / sqrt(4.2) = 1.13]
    • stiffer spring requires stiffer comp force AND stiffer reb force
    • stiffer spring rate will not change r/c ratio
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  • SEE ZETA CURVE NUMBERS BELOW
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  • Several riders of different weight and ability rode Cody's bike and said it worked great.
    • This curve is the stiffer of the two but has proportionally less c force.
  • Hunter rode a National Enduro with the nastiest, rockiest, rooted track he has ever ridden and said the bike worked great.
    • This curve is the softer of the two but has proportionally more c force.
 
  • The second graph shows that when (3171) is multiplied by  'zeta correction factor'  1.088:
    • The red curve becomes stiffer at 1-30ips.
    • The red curve is also proportionately stiffer at 5-20ips.
  • This is not a considerable difference, but it is a difference nonetheless.
  • Future curves are sure to have these sort of difference but to greater degrees.
  • SEE ZETA CURVE NUMBERS BELOW
 
  • ZETA CURVE NUMBERS
    • co-zeta curve (3304) was created from baseline/source test 3304 using a 4.65 spring.
    • co-zeta curve (3171) was created from baseline/source test 3171 using a 4.20 spring.
      • Table 1 shows the reverse engineered co wogas for 4.65 and 4.20 spring.
      • Table 2 shows the reverse engineered numbers for 4.65 and 4.65 spring.