Originally Posted by
trailangel
Yes I did read, and you didn't say you replaced chain and cassette in Jan. You said they are not worn. Cassette looks worn to me.
Have you checked your deraileur hanger alignment?
Don't put bike upside down.
I also replaced chainrings and pulleys in January, if it matters. I have a chain gauge, and it shows the chain is not yet 0.75% worn. I don't think the cassette can wear faster than the chain. Regardless, until today the chain never slipped on the 10th cog, even when pedaling as hard as I can. Now it slips all the time, even when pedaling slowly.
Originally Posted by
davidad
Are you sure that the high limit screw is adjusted properly. On shimano the pulley should a little outboard of center. The chain and cassette wear together and do not skip as they wear. A new chain on a worn out cassette will skip.
Yes, pretty sure. Actually I also tried to adjust it so that the pulley stays quite far on the outside, to make sure the chain doesn't climb on the 9th cog.