eduskator

You can't judge wear by looking at it? A worn-out cassette will have teeth looking a lot different than the OP's .

aliasfox

I'm not so sure. I did the opposite of the OP a long time ago on a mountain bike - wanted to replace my cassette with a lighter weight one, without realizing how much strain I had put on the drivetrain. Three trips to the bike shop later, I realized that my old chain had worn down to nearly 6 1/4", when the links should have been 6" apart. A new chain sorted out the skipping, but the old cassette didn't really look that worn without very, very close inspection.