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Shock spring rate question

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I need to get a new speing for my 2000 DRZ400E. i weigh 275 and it sags quite a bit when i sit on it. i know the stock spring rate is 5.3 k/mm. how do i calculate the right rate for my weight? this is a Motard and i'd like to make it fairly firm. thanks. BTW, the race tech calculator won't work for me.

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use the digital valving search......

it say you need .52 for springs.they dont exist that stiff.i believe .50 is as stiff as they come.

you need a 6.0 shock spring.no problem there.

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