2021 Svart 125/401 stiffer rear spring?

disuye

contributing rider
Joined
Jun 23, 2026
Messages
12
Location
Portugal
I need a much stiffer (or progressive?) rear spring – what options have forum members installed?

Am riding far more gravel / rutted farm tracks than smooth tarmac – evidence attached – and with 105kg build + 15kg gear, the stock spring at max preload is still too soft.

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p.s: I am new to new to motorcycling, so not sure what spring specs / brands / dimensions I'm supposed to search for. But I have worked on cars for years, so the job does not phase me. This is for a 2021 Svart 125, but the 401 sub forum is much more active with people modifying their bikes. Cheers!

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