progessive the weight increses as the sping is compressed say250 lbs first inch 350 second 500 third inch
specific first inch 500 second 500 ect
progressive gives better day to day
specific for better handeling
really simplified as my brain sees it
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89 with 331 t3'/t4 hybrids. upr Suspention worked out finnaly . 9.89 144 mph .
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