I've had excellent results from my previous Sram drivetrains. My last moutainbike cassette did over 10000km, without slipping at all, when I used 3 GX chains rotated religiously between 700 and 800 km. My current gravel bike Red chain is at 13500km and cassette is at 14400 km with zero slipping, but I let the chain run just to .5 at about 11000 km and found that the cassette wouldn't take another chain, so Im just running it out.
My current Epic started slipping only when under heavy load only in the 3rd smallest gear at about 2500km. By that age it had an xx1 chain that had done 1600km. I checked everything. Nothing was out of adjustment so I put up with it to just over 5000km. And then I annoyingly replaced the cassette and xx1 chain and chainring. It's now done under 1500km and is slipping again on the same gear!!! I checked everything, but this time took it to my local bike shop, where a lifelong bike mechanic checked it all, replaced the jockey pulleys and gave it a tweak. Its was fine for a while, but is slipping again.
Im finding it hard to understand it is giving problems so quickly when the others have been treated exactly the same.
