Cassette issues

[Unsealedchimp]

Hello,

Please could anyone advise on some issues that I currently have with my MTB drive chain.

I recently replaced my complete drive chain and all was looking good with the fine tuning until I used my MTB today and the problems started.
The issues that seem to be occurring is that the cassette changes with no problems but some of the gears do not seem to operate correctly.

IE they keep popping back off the cassette gears before re-latching and again pop back off the gears. During this the chain seems to be riding on the edge of the gears.

This is only on a few gears and the others work perfectly. It almost seems that the cassette spacing is too tight between the gears but was a brand new cassette so am a little unsure where the issue lies.

The front crack gears are spot on and the gears also change ok.

Any help on this would be a great help.

Thank you

[RBurrelli]

A few more details about what you changed would help with a proper answer. Pictures as well.

When you say you changed the complete drive chain, does that mean cassette and chain and crankset? Is you rear derailleur compatible with the changes your made?

[1FJEF]

Yes, you haven't mixed SRAM 1:1 with Shimano shifters or vice versa, something like that? Wait, that couldn't be it as you said it worked properly for awhile?