Originally Posted by
Gyro
It's a trek-domane-4-3-compact-56cm with a Shimano CS-4600 10spd, 12-30t
And what do you want to do for that trek-domane-4-3-compact-56cm with a Shimano CS-4600 10spd, with a 12-30 cassette? CS-4600's are no longer manufactured but there are other 10 speed cassettes you can put on it.
There'll be other considerations too when you change the cassette. One will be chain length. And getting a larger tooth count low cog might require a DR change. Also, if you have decided your cassette is worn out, then I'm assuming it's because you put a new chain on the bike and it now skips on some of the cogs. But if you haven't replaced the chain and there isn't any skipping, then there probably isn't any reason to change a 12-30 cassette for a 12-30 cassette.
Don't be shy...
Open up and share some details about why you seem focused on it being a 12-30 CS-4600 and nothing else.