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Generally your chain wears first, if you change it before it's too worn the cassette will be fine for a few chains, if not then you'll need to do both together, if you leave it way too long you'll wear the chainrings too but the wear usually spread over more teeth than the cassette so it can take longer/more chains.
snottyotter-
Yeah I've been through about 4 chains. I've had the same groupset for several years and thousands and thousands of miles and have never replaced the cassette. Maybe I'll get a grown up to give my gears some proper attention and see if that gets them running smoothly again. There's a decent chance that I've just not been able to adjust them to a good enough standard, rather than anything being worn out.
ltc
Good to know, thank you. I'll stick to 105 then. The cassette is definitely a bit worn, the chain rings have significantly fewer miles on them due to switching cranksets since I bought the groupset but thought I might as well do the lot at the same time.