So, the title says it all. If I wanted to ask questions about mountain biking, should they be posted here or on the cycling SE?
I think for both this and indoor climbing, we have to ask which groups share the most in common.
In this case, I think mountain biking will have more in common and share more commonalities with other biking activities than with other TGO activities and thus should go on biking
While I totally agree this question fits better into biking.SE, the same is true for so many things we considered on topic (e.g. all kinds of animal related stuff). We even declared rail biking as on topic.