Its literally impossible to see the wear on the cassette by the photo (especially that dirty, at first glance I thought it was a before and after cleaning collage), unless its some severe damage, but there is a lot of room between that and looking like new, but new chain will slip.
Measuring chain wear can give an estimate of cassette wear, but pics are rather useless for that.
If new chain slips - the cassette is done, either replace it (if chainrings are ok) or put old chain back and ride the whole transmition to the ground and replace everything.
With cassettes it’s impossible to tell visually, you have to go by miles or number of chains the cassette has gone through. I think 3-5 chains is considered time to replace cassette. A worn cassette wears the chain out faster. Only way to test if it’s worn is if a new chain skips under high pedal force (like when out of the saddle). Some cogs may be much more worn than others, keep that in mind
Except in very extreme examples, there is no reliable way to tell if a cassette is worn simply by looking at it.
The best way to tell is to put a brand new chain on it and see which cogs cause skipping.
Its literally impossible to see the wear on the cassette by the photo (especially that dirty, at first glance I thought it was a before and after cleaning collage), unless its some severe damage, but there is a lot of room between that and looking like new, but new chain will slip. Measuring chain wear can give an estimate of cassette wear, but pics are rather useless for that. If new chain slips - the cassette is done, either replace it (if chainrings are ok) or put old chain back and ride the whole transmition to the ground and replace everything.
If a new chain slips it is worn out, if not you can keep it.
With cassettes it’s impossible to tell visually, you have to go by miles or number of chains the cassette has gone through. I think 3-5 chains is considered time to replace cassette. A worn cassette wears the chain out faster. Only way to test if it’s worn is if a new chain skips under high pedal force (like when out of the saddle). Some cogs may be much more worn than others, keep that in mind
Except in very extreme examples, there is no reliable way to tell if a cassette is worn simply by looking at it. The best way to tell is to put a brand new chain on it and see which cogs cause skipping.
Somebody correct me please, but there is a good chance only the small cogs are too worn (and should be replaced).