Stroker Performance Review

Could you explain this to me. It says 390 per inch so wouldn't going from 1.9 to 1.8 increase it by 39lbs or is there something I am missing or not understanding?

70aarcuda said

Those are PAC 1903 springs.....I shimmed mind down to 1.80 ...which will get you to 145 lbs on the seat...,,,,

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