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I've got some Rockshox Recon Tk Gold 29r forks with 100mm travel. I think they are a couple of years old so 2014ish. Can they be converted to 120mm, I've heard of spacers being used etc?...
Some do, some don't - I'm not sure of exactly which models can do this. Generally the only way to be sure is to open them up and see if there is a spacer on the air side you can take out to increase the travel. My Gold RLs disappointingly didn't have the option to go to 120.
I did on some Recon silvers of about the same year, it was easy enough. Service manual here, the info you want it on page 8 I think.
Cheers chaps