Slight digression but can I ask, if I were to stick a narrow/wide chainring on my year old drivetrain would that work straight out? (generally speaking) Or am I more than likely gong to have to replace the chain and hence the cassette too?
I put a reasonably used chain on mine, worked out just fine- I’m not sure it’s any different to any other chainring in that respect.
(though, if you think it all the way through… If you fit a new chain and you find the old cassette causes problems, then everything was actually pretty shagged out already and so putting a new chainring on that lot probably doesn’t make a lot of sense, even if it works fine it’ll wear the new ring faster)