Greetings from the Nordics! I have had already for a few weeks Nokia Hakkapeliitta 9 studded tyres (in R20) installed, and have been happy with them apart from the noise level that is higher than my previous studded tyres. This could also be because the tyres are still new, and thus the studs have not yet fully embedded in.
They are available also on 285/45 R21, you can check on
https://www.nokiantyres.com/tyres/by...s/?s=285-45-21