Originally Posted by
tomato coupe
You're citing the rejection of "groupset" by the BF spellchecker as confirmation that it's an invalid term. But, you're not applying that same standard to "wheelset" or "chainset", which you think are valid terms.
Again: "groupset" = "group," as used in bikespeak.
"Wheelset" = "wheels," arguably, but is a long-established term.
"Chainset" = no other single term I'm aware of.
"Groupset" (as I've learned since I started this thread) came into use in British English as a back-formation from "chainset" by replacement of "chain" by "group." "Chainset" = drive train group; "groupset" = complete group of all relevant components, not just the drive train components. A useful term.
Since "chainset" has never caught on in American English, "groupset" is a needless addition to the cycling lexicon in the U.S. It adds nothing to the meaning of "group." Its only merit: it is satisfying insider jargon. A shibboleth for those in the know.