Decathlon rc120 rear derailleur

[Tlandcruiser]

Does anyone know what rear derailleur fits the decathlon rc120? Mine broke. It’s a microshift but I can’t see any details on the bike and nothing within the maintenance manual. I believe it would be compatible with shimano…but what length too 😁

[Your Dad]

Can you post a pic of what’s currently fitted?

[OutInTheShed]

The critical things are
having a long enough cage to cope with the range of gears
having the correct mm of cable movement per mm of sprocket spacing. Or mm per 'click' from one gear to the next.

Not even all Shimano parts are compatible with other shimano parts.
10 speed not the same as 8 speed, cheaper ranges don't match with top ranges, Mountain does not mix with road except 'sometimes'.

The Sheldon Brown website is a good resource, IMHO.

[Barchettaman]

This should do the job:

https://www.wiggle.co.uk/microshift-mezzo-rd-m36-8...