WTF is going on here?! Progressive vs OEM springs 650 Dakar quality

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michnus

Bachelor Dog
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The first spring is a Wirth I got from 30000km ago, if I remember correct it was the same length as the OEM ones at the time which is the one on the far right which I replaced with these ones.
The spring in the middle is also OEM from the second Dakar I got with 40000km on the odo, just replaced them with a set of Wirth progressive springs.  :-\

Wirth just kak quality?
Why did the OEM ones show sag in 40000km? Maybe this is normal for a spring to sag a bit and it seems the oem ones are not that bad quality then?

Is it in the long run worth fitting aftermarket springs if this is what happens after such short distances?

Must these be rated for weight per rider because the Wirth comes in one standard size?
 

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