Please keep in mind, that with the WG Forums approval of “Campfire” type discussions, regardless of original subject, is app to change and drift at times. This is how the “campfire” style discussions that are encouraged, goes at times.
It’s does not occur out of disrespect to the member who started the thread and it’s happened to most all members, who post regularly, at one time or another.
It’s the responsibility of the original thread owner to guide their post back to the starting point if they so desire or one can just go with the direction of the conversation at that time.
The only rules for off motorcycle topic or motorcycle topic as far as this goes are the four rules listed under the General Discussion subject.