Alex321
Guru
- Location
- South Wales
Nope, if it isn't a full group of matching components from the same series, it is not a group set.
If I sold just a rear derailleur and called it a group set I’d get called out for it. The clue is in “group” and “set”.
Any one part, such as the rear derailleur you mention is obviously not a groupset.
I would argue that the combination of all the drivetrain and brake parts on a bike is a groupset, even if they come from multiple series.
You might say something like "my groupset is mainly ultegra, but with a 105 cassette".